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Theorem List for Metamath Proof Explorer - 38701-38800   *Has distinct variable group(s)
TypeLabelDescription
Statement
 
Theoremcdleme24 38701* Quantified version of cdleme21k 38687. (Contributed by NM, 26-Dec-2012.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑅 ∨ 𝑠) ∧ π‘Š)))    &   πΊ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝐺 ∨ ((𝑅 ∨ 𝑑) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑃 β‰  𝑄 ∧ 𝑅 ≀ (𝑃 ∨ 𝑄))) β†’ βˆ€π‘  ∈ 𝐴 βˆ€π‘‘ ∈ 𝐴 (((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) ∧ (Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄))) β†’ 𝑁 = 𝑂))
 
Theoremcdleme25a 38702* Lemma for cdleme25b 38703. (Contributed by NM, 1-Jan-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑅 ∨ 𝑠) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑃 β‰  𝑄 ∧ 𝑅 ≀ (𝑃 ∨ 𝑄))) β†’ βˆƒπ‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) ∧ 𝑁 ∈ 𝐡))
 
Theoremcdleme25b 38703* Transform cdleme24 38701. TODO get rid of $d's on π‘ˆ, 𝑁 (Contributed by NM, 1-Jan-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑅 ∨ 𝑠) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑃 β‰  𝑄 ∧ 𝑅 ≀ (𝑃 ∨ 𝑄))) β†’ βˆƒπ‘’ ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))
 
Theoremcdleme25c 38704* Transform cdleme25b 38703. (Contributed by NM, 1-Jan-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑅 ∨ 𝑠) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑃 β‰  𝑄 ∧ 𝑅 ≀ (𝑃 ∨ 𝑄))) β†’ βˆƒ!𝑒 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))
 
Theoremcdleme25dN 38705* Transform cdleme25c 38704. (Contributed by NM, 19-Jan-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑅 ∨ 𝑠) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑃 β‰  𝑄 ∧ 𝑅 ≀ (𝑃 ∨ 𝑄))) β†’ βˆƒ!𝑒 ∈ 𝐡 βˆƒπ‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) ∧ 𝑒 = 𝑁))
 
Theoremcdleme25cl 38706* Show closure of the unique element in cdleme25c 38704. (Contributed by NM, 2-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑅 ∨ 𝑠) ∧ π‘Š)))    &   πΌ = (℩𝑒 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑃 β‰  𝑄 ∧ 𝑅 ≀ (𝑃 ∨ 𝑄))) β†’ 𝐼 ∈ 𝐡)
 
Theoremcdleme25cv 38707* Change bound variables in cdleme25c 38704. (Contributed by NM, 2-Feb-2013.)
𝐹 = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑅 ∨ 𝑠) ∧ π‘Š)))    &   πΊ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝐺 ∨ ((𝑅 ∨ 𝑧) ∧ π‘Š)))    &   πΌ = (℩𝑒 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    β‡’   πΌ = 𝐸
 
Theoremcdleme26e 38708* Part of proof of Lemma E in [Crawley] p. 113, 3rd paragraph, 4th line on p. 115. 𝐹, 𝑁, 𝑂 represent f(z), fz(s), fz(t) respectively. When t ∨ v = p ∨ q, fz(s) ≀ fz(t) ∨ v. TODO: FIX COMMENT. (Contributed by NM, 2-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑆 ∨ 𝑧) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑇 ∨ 𝑧) ∧ π‘Š)))    &   πΌ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ ((𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š) ∧ (𝑇 ∈ 𝐴 ∧ Β¬ 𝑇 ≀ π‘Š) ∧ (𝑉 ∈ 𝐴 ∧ 𝑉 ≀ π‘Š)) ∧ ((𝑃 β‰  𝑄 ∧ 𝑆 ≀ (𝑃 ∨ 𝑄) ∧ 𝑇 ≀ (𝑃 ∨ 𝑄)) ∧ ((𝑇 ∨ 𝑉) = (𝑃 ∨ 𝑄) ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑧 ∈ 𝐴 ∧ Β¬ 𝑧 ≀ π‘Š))) β†’ 𝐼 ≀ (𝐸 ∨ 𝑉))
 
Theoremcdleme26ee 38709* Part of proof of Lemma E in [Crawley] p. 113, 3rd paragraph, 4th line on p. 115. 𝐹, 𝑁, 𝑂 represent f(z), fz(s), fz(t) respectively. When t ∨ v = p ∨ q, fz(s) ≀ fz(t) ∨ v. TODO: FIX COMMENT. (Contributed by NM, 2-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑆 ∨ 𝑧) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑇 ∨ 𝑧) ∧ π‘Š)))    &   πΌ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ ((𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š) ∧ (𝑇 ∈ 𝐴 ∧ Β¬ 𝑇 ≀ π‘Š) ∧ (𝑉 ∈ 𝐴 ∧ 𝑉 ≀ π‘Š)) ∧ ((𝑃 β‰  𝑄 ∧ 𝑆 ≀ (𝑃 ∨ 𝑄) ∧ 𝑇 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑇 ∨ 𝑉) = (𝑃 ∨ 𝑄))) β†’ 𝐼 ≀ (𝐸 ∨ 𝑉))
 
Theoremcdleme26eALTN 38710* Part of proof of Lemma E in [Crawley] p. 113, 3rd paragraph, 4th line on p. 115. 𝐹, 𝑁, 𝑂 represent f(z), fz(s), fz(t) respectively. When t ∨ v = p ∨ q, fz(s) ≀ fz(t) ∨ v. TODO: FIX COMMENT. (Contributed by NM, 1-Feb-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑦 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑦) ∧ π‘Š)))    &   πΊ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑆 ∨ 𝑦) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝐺 ∨ ((𝑇 ∨ 𝑧) ∧ π‘Š)))    &   πΌ = (℩𝑒 ∈ 𝐡 βˆ€π‘¦ ∈ 𝐴 ((Β¬ 𝑦 ≀ π‘Š ∧ Β¬ 𝑦 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š ∧ 𝑆 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑇 ∈ 𝐴 ∧ Β¬ 𝑇 ≀ π‘Š ∧ 𝑇 ≀ (𝑃 ∨ 𝑄))) ∧ ((𝑉 ∈ 𝐴 ∧ 𝑉 ≀ π‘Š ∧ (𝑇 ∨ 𝑉) = (𝑃 ∨ 𝑄)) ∧ (𝑦 ∈ 𝐴 ∧ Β¬ 𝑦 ≀ π‘Š ∧ Β¬ 𝑦 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑧 ∈ 𝐴 ∧ Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)))) β†’ 𝐼 ≀ (𝐸 ∨ 𝑉))
 
Theoremcdleme26fALTN 38711* Part of proof of Lemma E in [Crawley] p. 113, 3rd paragraph, 6th and 7th lines on p. 115. 𝐹, 𝑁 represent f(t), ft(s) respectively. If t ≀ t ∨ v, then ft(s) ≀ f(t) ∨ v. TODO: FIX COMMENT. (Contributed by NM, 1-Feb-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑆 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑒 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 β‰  𝑄 ∧ 𝑆 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑑 ∈ 𝐴 ∧ Β¬ 𝑑 ≀ π‘Š)) ∧ ((𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š) ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š)) ∧ ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑆 β‰  𝑑 ∧ 𝑆 ≀ (𝑑 ∨ 𝑉)) ∧ (𝑉 ∈ 𝐴 ∧ 𝑉 ≀ π‘Š))) β†’ 𝐼 ≀ (𝐹 ∨ 𝑉))
 
Theoremcdleme26f 38712* Part of proof of Lemma E in [Crawley] p. 113, 3rd paragraph, 6th and 7th lines on p. 115. 𝐹, 𝑁 represent f(t), ft(s) respectively. If t ≀ t ∨ v, then ft(s) ≀ f(t) ∨ v. TODO: FIX COMMENT. (Contributed by NM, 1-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝐹 ∨ ((𝑆 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑒 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 β‰  𝑄 ∧ 𝑆 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑑 ∈ 𝐴 ∧ Β¬ 𝑑 ≀ π‘Š)) ∧ ((𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š) ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š)) ∧ (Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄) ∧ (𝑆 β‰  𝑑 ∧ 𝑆 ≀ (𝑑 ∨ 𝑉)) ∧ (𝑉 ∈ 𝐴 ∧ 𝑉 ≀ π‘Š))) β†’ 𝐼 ≀ (𝐹 ∨ 𝑉))
 
Theoremcdleme26f2ALTN 38713* Part of proof of Lemma E in [Crawley] p. 113. cdleme26fALTN 38711 with s and t swapped (this case is not mentioned by them). If s ≀ t ∨ v, then f(s) ≀ fs(t) ∨ v. TODO: FIX COMMENT. (Contributed by NM, 1-Feb-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΊ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝐺 ∨ ((𝑇 ∨ 𝑠) ∧ π‘Š)))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 β‰  𝑄 ∧ 𝑇 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š)) ∧ ((𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š) ∧ (𝑇 ∈ 𝐴 ∧ Β¬ 𝑇 ≀ π‘Š)) ∧ ((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑠 β‰  𝑇 ∧ 𝑠 ≀ (𝑇 ∨ 𝑉)) ∧ (𝑉 ∈ 𝐴 ∧ 𝑉 ≀ π‘Š))) β†’ 𝐺 ≀ (𝐸 ∨ 𝑉))
 
Theoremcdleme26f2 38714* Part of proof of Lemma E in [Crawley] p. 113. cdleme26fALTN 38711 with s and t swapped (this case is not mentioned by them). If s ≀ t ∨ v, then f(s) ≀ fs(t) ∨ v. TODO: FIX COMMENT. (Contributed by NM, 1-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΊ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝐺 ∨ ((𝑇 ∨ 𝑠) ∧ π‘Š)))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 β‰  𝑄 ∧ 𝑇 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š)) ∧ ((𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š) ∧ (𝑇 ∈ 𝐴 ∧ Β¬ 𝑇 ≀ π‘Š)) ∧ (Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄) ∧ (𝑠 β‰  𝑇 ∧ 𝑠 ≀ (𝑇 ∨ 𝑉)) ∧ (𝑉 ∈ 𝐴 ∧ 𝑉 ≀ π‘Š))) β†’ 𝐺 ≀ (𝐸 ∨ 𝑉))
 
Theoremcdleme27cl 38715* Part of proof of Lemma E in [Crawley] p. 113. Closure of 𝐢. (Contributed by NM, 6-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    β‡’   (((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ ((𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ ((𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š) ∧ 𝑃 β‰  𝑄)) β†’ 𝐢 ∈ 𝐡)
 
Theoremcdleme27a 38716* Part of proof of Lemma E in [Crawley] p. 113. cdleme26f 38712 with s and t swapped (this case is not mentioned by them). If s ≀ t ∨ v, then f(s) ≀ fs(t) ∨ v. TODO: FIX COMMENT. (Contributed by NM, 3-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    &   πΊ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑑 ∨ 𝑧) ∧ π‘Š)))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    &   π‘Œ = if(𝑑 ≀ (𝑃 ∨ 𝑄), 𝐸, 𝐺)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ 𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š)) ∧ ((𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š) ∧ (𝑑 ∈ 𝐴 ∧ Β¬ 𝑑 ≀ π‘Š)) ∧ ((𝑠 β‰  𝑑 ∧ 𝑠 ≀ (𝑑 ∨ 𝑉)) ∧ (𝑉 ∈ 𝐴 ∧ 𝑉 ≀ π‘Š))) β†’ 𝐢 ≀ (π‘Œ ∨ 𝑉))
 
Theoremcdleme27b 38717* Lemma for cdleme27N 38718. (Contributed by NM, 3-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    &   πΊ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑑 ∨ 𝑧) ∧ π‘Š)))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    &   π‘Œ = if(𝑑 ≀ (𝑃 ∨ 𝑄), 𝐸, 𝐺)    β‡’   (𝑠 = 𝑑 β†’ 𝐢 = π‘Œ)
 
Theoremcdleme27N 38718* Part of proof of Lemma E in [Crawley] p. 113. Eliminate the 𝑠 β‰  𝑑 antecedent in cdleme27a 38716. (Contributed by NM, 3-Feb-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    &   πΊ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑑 ∨ 𝑧) ∧ π‘Š)))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    &   π‘Œ = if(𝑑 ≀ (𝑃 ∨ 𝑄), 𝐸, 𝐺)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ 𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š)) ∧ ((𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š) ∧ (𝑑 ∈ 𝐴 ∧ Β¬ 𝑑 ≀ π‘Š)) ∧ (𝑠 ≀ (𝑑 ∨ 𝑉) ∧ (𝑉 ∈ 𝐴 ∧ 𝑉 ≀ π‘Š))) β†’ 𝐢 ≀ (π‘Œ ∨ 𝑉))
 
Theoremcdleme28a 38719* Lemma for cdleme25b 38703. TODO: FIX COMMENT. (Contributed by NM, 4-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    &   πΊ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑑 ∨ 𝑧) ∧ π‘Š)))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    &   π‘Œ = if(𝑑 ≀ (𝑃 ∨ 𝑄), 𝐸, 𝐺)    &   π‘‰ = ((𝑠 ∨ 𝑑) ∧ (𝑋 ∧ π‘Š))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š) ∧ (𝑑 ∈ 𝐴 ∧ Β¬ 𝑑 ≀ π‘Š)) ∧ (𝑠 β‰  𝑑 ∧ ((𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋 ∧ (𝑑 ∨ (𝑋 ∧ π‘Š)) = 𝑋) ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š))) β†’ (𝐢 ∨ (𝑋 ∧ π‘Š)) ≀ (π‘Œ ∨ (𝑋 ∧ π‘Š)))
 
Theoremcdleme28b 38720* Lemma for cdleme25b 38703. TODO: FIX COMMENT. (Contributed by NM, 6-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    &   πΊ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑑 ∨ 𝑧) ∧ π‘Š)))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    &   π‘Œ = if(𝑑 ≀ (𝑃 ∨ 𝑄), 𝐸, 𝐺)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š) ∧ (𝑑 ∈ 𝐴 ∧ Β¬ 𝑑 ≀ π‘Š)) ∧ (𝑠 β‰  𝑑 ∧ ((𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋 ∧ (𝑑 ∨ (𝑋 ∧ π‘Š)) = 𝑋) ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š))) β†’ (𝐢 ∨ (𝑋 ∧ π‘Š)) = (π‘Œ ∨ (𝑋 ∧ π‘Š)))
 
Theoremcdleme28c 38721* Part of proof of Lemma E in [Crawley] p. 113. Eliminate the 𝑠 β‰  𝑑 antecedent in cdleme28b 38720. TODO: FIX COMMENT. (Contributed by NM, 6-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    &   πΊ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑑 ∨ 𝑧) ∧ π‘Š)))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    &   π‘Œ = if(𝑑 ≀ (𝑃 ∨ 𝑄), 𝐸, 𝐺)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š) ∧ (𝑑 ∈ 𝐴 ∧ Β¬ 𝑑 ≀ π‘Š)) ∧ ((𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋 ∧ (𝑑 ∨ (𝑋 ∧ π‘Š)) = 𝑋 ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š))) β†’ (𝐢 ∨ (𝑋 ∧ π‘Š)) = (π‘Œ ∨ (𝑋 ∧ π‘Š)))
 
Theoremcdleme28 38722* Quantified version of cdleme28c 38721. (Compare cdleme24 38701.) (Contributed by NM, 7-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    &   πΊ = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑑 ∨ 𝑧) ∧ π‘Š)))    &   πΈ = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑂))    &   π‘Œ = if(𝑑 ≀ (𝑃 ∨ 𝑄), 𝐸, 𝐺)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š)) β†’ βˆ€π‘  ∈ 𝐴 βˆ€π‘‘ ∈ 𝐴 (((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋) ∧ (Β¬ 𝑑 ≀ π‘Š ∧ (𝑑 ∨ (𝑋 ∧ π‘Š)) = 𝑋)) β†’ (𝐢 ∨ (𝑋 ∧ π‘Š)) = (π‘Œ ∨ (𝑋 ∧ π‘Š))))
 
Theoremcdleme29ex 38723* Lemma for cdleme29b 38724. (Compare cdleme25a 38702.) TODO: FIX COMMENT. (Contributed by NM, 7-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š)) β†’ βˆƒπ‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋) ∧ (𝐢 ∨ (𝑋 ∧ π‘Š)) ∈ 𝐡))
 
Theoremcdleme29b 38724* Transform cdleme28 38722. (Compare cdleme25b 38703.) TODO: FIX COMMENT. (Contributed by NM, 7-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š)) β†’ βˆƒπ‘£ ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋) β†’ 𝑣 = (𝐢 ∨ (𝑋 ∧ π‘Š))))
 
Theoremcdleme29c 38725* Transform cdleme28b 38720. (Compare cdleme25c 38704.) TODO: FIX COMMENT. (Contributed by NM, 8-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š)) β†’ βˆƒ!𝑣 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋) β†’ 𝑣 = (𝐢 ∨ (𝑋 ∧ π‘Š))))
 
Theoremcdleme29cl 38726* Show closure of the unique element in cdleme28c 38721. (Contributed by NM, 8-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = ((𝑧 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑧) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (𝑍 ∨ ((𝑠 ∨ 𝑧) ∧ π‘Š)))    &   π· = (℩𝑒 ∈ 𝐡 βˆ€π‘§ ∈ 𝐴 ((Β¬ 𝑧 ≀ π‘Š ∧ Β¬ 𝑧 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝑁))    &   πΆ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐷, 𝐹)    &   πΌ = (℩𝑣 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋) β†’ 𝑣 = (𝐢 ∨ (𝑋 ∧ π‘Š))))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š)) β†’ 𝐼 ∈ 𝐡)
 
Theoremcdleme30a 38727 Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 9-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    β‡’   (((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑠 ∈ 𝐴 ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š) ∧ π‘Œ ∈ 𝐡) ∧ ((𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋 ∧ 𝑋 ≀ π‘Œ)) β†’ (𝑠 ∨ (π‘Œ ∧ π‘Š)) = π‘Œ)
 
Theoremcdleme31so 38728* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 25-Feb-2013.)
𝑂 = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΆ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋) β†’ 𝑧 = (𝑁 ∨ (𝑋 ∧ π‘Š))))    β‡’   (𝑋 ∈ 𝐡 β†’ ⦋𝑋 / π‘₯β¦Œπ‘‚ = 𝐢)
 
Theoremcdleme31sn 38729* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 26-Feb-2013.)
𝑁 = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐷)    &   πΆ = if(𝑅 ≀ (𝑃 ∨ 𝑄), ⦋𝑅 / π‘ β¦ŒπΌ, ⦋𝑅 / π‘ β¦Œπ·)    β‡’   (𝑅 ∈ 𝐴 β†’ ⦋𝑅 / π‘ β¦Œπ‘ = 𝐢)
 
Theoremcdleme31sn1 38730* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 26-Feb-2013.)
𝐼 = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐺))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐷)    &   πΆ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = ⦋𝑅 / π‘ β¦ŒπΊ))    β‡’   ((𝑅 ∈ 𝐴 ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ ⦋𝑅 / π‘ β¦Œπ‘ = 𝐢)
 
Theoremcdleme31se 38731* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 26-Feb-2013.)
𝐸 = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑇) ∧ π‘Š)))    &   π‘Œ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑅 ∨ 𝑇) ∧ π‘Š)))    β‡’   (𝑅 ∈ 𝐴 β†’ ⦋𝑅 / π‘ β¦ŒπΈ = π‘Œ)
 
Theoremcdleme31se2 38732* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 3-Apr-2013.)
𝐸 = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑅 ∨ 𝑑) ∧ π‘Š)))    &   π‘Œ = ((𝑃 ∨ 𝑄) ∧ (⦋𝑆 / π‘‘β¦Œπ· ∨ ((𝑅 ∨ 𝑆) ∧ π‘Š)))    β‡’   (𝑆 ∈ 𝐴 β†’ ⦋𝑆 / π‘‘β¦ŒπΈ = π‘Œ)
 
Theoremcdleme31sc 38733* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 31-Mar-2013.)
𝐢 = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘‹ = ((𝑅 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)))    β‡’   (𝑅 ∈ 𝐴 β†’ ⦋𝑅 / π‘ β¦ŒπΆ = 𝑋)
 
Theoremcdleme31sde 38734* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 31-Mar-2013.)
𝐷 = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   π‘Œ = ((𝑆 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑆) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (π‘Œ ∨ ((𝑅 ∨ 𝑆) ∧ π‘Š)))    β‡’   ((𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴) β†’ ⦋𝑅 / π‘ β¦Œβ¦‹π‘† / π‘‘β¦ŒπΈ = 𝑍)
 
Theoremcdleme31snd 38735* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 1-Apr-2013.)
𝐷 = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘ = ((𝑣 ∨ 𝑉) ∧ (𝑃 ∨ ((𝑄 ∨ 𝑣) ∧ π‘Š)))    &   πΈ = ((𝑂 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑂) ∧ π‘Š)))    &   π‘‚ = ((𝑆 ∨ 𝑉) ∧ (𝑃 ∨ ((𝑄 ∨ 𝑆) ∧ π‘Š)))    β‡’   (𝑆 ∈ 𝐴 β†’ ⦋𝑆 / π‘£β¦Œβ¦‹π‘ / π‘‘β¦Œπ· = 𝐸)
 
Theoremcdleme31sdnN 38736* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 31-Mar-2013.) (New usage is discouraged.)
𝐢 = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, ⦋𝑠 / π‘‘β¦Œπ·)
 
Theoremcdleme31sn1c 38737* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 1-Mar-2013.)
𝐺 = ((𝑃 ∨ 𝑄) ∧ (𝐸 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐺))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐷)    &   π‘Œ = ((𝑃 ∨ 𝑄) ∧ (𝐸 ∨ ((𝑅 ∨ 𝑑) ∧ π‘Š)))    &   πΆ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = π‘Œ))    β‡’   ((𝑅 ∈ 𝐴 ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ ⦋𝑅 / π‘ β¦Œπ‘ = 𝐢)
 
Theoremcdleme31sn2 38738* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 26-Feb-2013.)
𝐷 = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐷)    &   πΆ = ((𝑅 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)))    β‡’   ((𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ ⦋𝑅 / π‘ β¦Œπ‘ = 𝐢)
 
Theoremcdleme31fv 38739* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 10-Feb-2013.)
𝑂 = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    &   πΆ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋) β†’ 𝑧 = (𝑁 ∨ (𝑋 ∧ π‘Š))))    β‡’   (𝑋 ∈ 𝐡 β†’ (πΉβ€˜π‘‹) = if((𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š), 𝐢, 𝑋))
 
Theoremcdleme31fv1 38740* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 10-Feb-2013.)
𝑂 = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    &   πΆ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋) β†’ 𝑧 = (𝑁 ∨ (𝑋 ∧ π‘Š))))    β‡’   ((𝑋 ∈ 𝐡 ∧ (𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š)) β†’ (πΉβ€˜π‘‹) = 𝐢)
 
Theoremcdleme31fv1s 38741* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 25-Feb-2013.)
𝑂 = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((𝑋 ∈ 𝐡 ∧ (𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š)) β†’ (πΉβ€˜π‘‹) = ⦋𝑋 / π‘₯β¦Œπ‘‚)
 
Theoremcdleme31fv2 38742* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 23-Feb-2013.)
𝐹 = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((𝑋 ∈ 𝐡 ∧ Β¬ (𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š)) β†’ (πΉβ€˜π‘‹) = 𝑋)
 
Theoremcdleme31id 38743* Part of proof of Lemma E in [Crawley] p. 113. (Contributed by NM, 18-Apr-2013.)
𝐹 = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((𝑋 ∈ 𝐡 ∧ 𝑃 = 𝑄) β†’ (πΉβ€˜π‘‹) = 𝑋)
 
Theoremcdlemefrs29pre00 38744 ***START OF VALUE AT ATOM STUFF TO REPLACE ONES BELOW*** FIX COMMENT. TODO: see if this is the optimal utility theorem using lhpmat 38379. (Contributed by NM, 29-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   (𝑠 = 𝑅 β†’ (πœ‘ ↔ πœ“))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ πœ“) ∧ 𝑠 ∈ 𝐴) β†’ (((Β¬ 𝑠 ≀ π‘Š ∧ πœ‘) ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) ↔ (Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅)))
 
Theoremcdlemefrs29bpre0 38745* TODO fix comment. (Contributed by NM, 29-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   (𝑠 = 𝑅 β†’ (πœ‘ ↔ πœ“))    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ (Β¬ 𝑠 ≀ π‘Š ∧ πœ‘))) β†’ 𝑁 ∈ 𝐡)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ (βˆ€π‘  ∈ 𝐴 (((Β¬ 𝑠 ≀ π‘Š ∧ πœ‘) ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))) ↔ 𝑧 = ⦋𝑅 / π‘ β¦Œπ‘))
 
Theoremcdlemefrs29bpre1 38746* TODO: FIX COMMENT. (Contributed by NM, 29-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   (𝑠 = 𝑅 β†’ (πœ‘ ↔ πœ“))    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ (Β¬ 𝑠 ≀ π‘Š ∧ πœ‘))) β†’ 𝑁 ∈ 𝐡)    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ ⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐡)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ βˆƒπ‘§ ∈ 𝐡 βˆ€π‘  ∈ 𝐴 (((Β¬ 𝑠 ≀ π‘Š ∧ πœ‘) ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))))
 
Theoremcdlemefrs29cpre1 38747* TODO: FIX COMMENT. (Contributed by NM, 29-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   (𝑠 = 𝑅 β†’ (πœ‘ ↔ πœ“))    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ (Β¬ 𝑠 ≀ π‘Š ∧ πœ‘))) β†’ 𝑁 ∈ 𝐡)    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ ⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐡)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ βˆƒ!𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 (((Β¬ 𝑠 ≀ π‘Š ∧ πœ‘) ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))))
 
Theoremcdlemefrs29clN 38748* TODO: NOT USED? Show closure of the unique element in cdlemefrs29cpre1 38747. (Contributed by NM, 29-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   (𝑠 = 𝑅 β†’ (πœ‘ ↔ πœ“))    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ (Β¬ 𝑠 ≀ π‘Š ∧ πœ‘))) β†’ 𝑁 ∈ 𝐡)    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ ⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐡)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ 𝑂 ∈ 𝐡)
 
Theoremcdlemefrs32fva 38749* Part of proof of Lemma E in [Crawley] p. 113. Value of 𝐹 at an atom not under π‘Š. TODO: FIX COMMENT. TODO: consolidate uses of lhpmat 38379 here and elsewhere, and presence/absence of 𝑠 ≀ (𝑃 ∨ 𝑄) term. Also, why can proof be shortened with cdleme29cl 38726? What is difference from cdlemefs27cl 38762? (Contributed by NM, 29-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   (𝑠 = 𝑅 β†’ (πœ‘ ↔ πœ“))    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ (Β¬ 𝑠 ≀ π‘Š ∧ πœ‘))) β†’ 𝑁 ∈ 𝐡)    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ ⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐡)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ ⦋𝑅 / π‘₯β¦Œπ‘‚ = ⦋𝑅 / π‘ β¦Œπ‘)
 
Theoremcdlemefrs32fva1 38750* Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT. (Contributed by NM, 29-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   (𝑠 = 𝑅 β†’ (πœ‘ ↔ πœ“))    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑃 β‰  𝑄 ∧ (𝑠 ∈ 𝐴 ∧ (Β¬ 𝑠 ≀ π‘Š ∧ πœ‘))) β†’ 𝑁 ∈ 𝐡)    &   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ ⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐡)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ πœ“) β†’ (πΉβ€˜π‘…) = ⦋𝑅 / π‘ β¦Œπ‘)
 
Theoremcdlemefr29exN 38751* Lemma for cdlemefs29bpre1N 38766. (Compare cdleme25a 38702.) TODO: FIX COMMENT. TODO: IS THIS NEEDED? (Contributed by NM, 28-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑋 ∈ 𝐡 ∧ Β¬ 𝑋 ≀ π‘Š)) ∧ βˆ€π‘  ∈ 𝐴 𝐢 ∈ 𝐡) β†’ βˆƒπ‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋) ∧ (𝐢 ∨ (𝑋 ∧ π‘Š)) ∈ 𝐡))
 
Theoremcdlemefr27cl 38752 Part of proof of Lemma E in [Crawley] p. 113. Closure of 𝑁. (Contributed by NM, 23-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) ∧ (𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄) ∧ 𝑃 β‰  𝑄)) β†’ 𝑁 ∈ 𝐡)
 
Theoremcdlemefr32sn2aw 38753* Show that ⦋𝑅 / π‘ β¦Œπ‘ is an atom not under π‘Š when Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄). (Contributed by NM, 28-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐴 ∧ Β¬ ⦋𝑅 / π‘ β¦Œπ‘ ≀ π‘Š))
 
Theoremcdlemefr32snb 38754* Show closure of ⦋𝑅 / π‘ β¦Œπ‘. (Contributed by NM, 28-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ ⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐡)
 
Theoremcdlemefr29bpre0N 38755* TODO fix comment. (Contributed by NM, 28-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (βˆ€π‘  ∈ 𝐴 (((Β¬ 𝑠 ≀ π‘Š ∧ Β¬ 𝑠 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))) ↔ 𝑧 = ⦋𝑅 / π‘ β¦Œπ‘))
 
Theoremcdlemefr29clN 38756* Show closure of the unique element in cdleme29c 38725. TODO fix comment. TODO Not needed? (Contributed by NM, 29-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑂 ∈ 𝐡)
 
Theoremcdleme43frv1snN 38757* Value of ⦋𝑅 / π‘ β¦Œπ‘ when Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄). (Contributed by NM, 30-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‹ = ((𝑅 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)))    β‡’   ((𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ ⦋𝑅 / π‘ β¦Œπ‘ = 𝑋)
 
Theoremcdlemefr32fvaN 38758* Part of proof of Lemma E in [Crawley] p. 113. Value of 𝐹 at an atom not under π‘Š. TODO: FIX COMMENT. (Contributed by NM, 29-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ ⦋𝑅 / π‘₯β¦Œπ‘‚ = ⦋𝑅 / π‘ β¦Œπ‘)
 
Theoremcdlemefr32fva1 38759* Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT. (Contributed by NM, 29-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (πΉβ€˜π‘…) = ⦋𝑅 / π‘ β¦Œπ‘)
 
Theoremcdlemefr31fv1 38760* Value of (πΉβ€˜π‘…) when Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄). TODO This may be useful for shortening others that now use riotasv 37307 3d . TODO: FIX COMMENT. (Contributed by NM, 30-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    &   π‘‹ = ((𝑅 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (πΉβ€˜π‘…) = 𝑋)
 
Theoremcdlemefs29pre00N 38761 FIX COMMENT. TODO: see if this is the optimal utility theorem using lhpmat 38379. (Contributed by NM, 27-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) ∧ 𝑠 ∈ 𝐴) β†’ (((Β¬ 𝑠 ≀ π‘Š ∧ 𝑠 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) ↔ (Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅)))
 
Theoremcdlemefs27cl 38762* Part of proof of Lemma E in [Crawley] p. 113. Closure of 𝑁. TODO FIX COMMENT This is the start of a re-proof of cdleme27cl 38715 etc. with the 𝑠 ≀ (𝑃 ∨ 𝑄) condition (so as to not have the 𝐢 hypothesis). (Contributed by NM, 24-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑒 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑒 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ ((𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š) ∧ 𝑠 ≀ (𝑃 ∨ 𝑄) ∧ 𝑃 β‰  𝑄)) β†’ 𝑁 ∈ 𝐡)
 
Theoremcdlemefs32sn1aw 38763* Show that ⦋𝑅 / π‘ β¦Œπ‘ is an atom not under π‘Š when 𝑅 ≀ (𝑃 ∨ 𝑄). (Contributed by NM, 24-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘Œ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑅 ∨ 𝑑) ∧ π‘Š)))    &   π‘ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = π‘Œ))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐴 ∧ Β¬ ⦋𝑅 / π‘ β¦Œπ‘ ≀ π‘Š))
 
Theoremcdlemefs32snb 38764* Show closure of ⦋𝑅 / π‘ β¦Œπ‘. (Contributed by NM, 24-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ ⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐡)
 
Theoremcdlemefs29bpre0N 38765* TODO: FIX COMMENT. (Contributed by NM, 26-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (βˆ€π‘  ∈ 𝐴 (((Β¬ 𝑠 ≀ π‘Š ∧ 𝑠 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))) ↔ 𝑧 = ⦋𝑅 / π‘ β¦Œπ‘))
 
Theoremcdlemefs29bpre1N 38766* TODO: FIX COMMENT. (Contributed by NM, 27-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ βˆƒπ‘§ ∈ 𝐡 βˆ€π‘  ∈ 𝐴 (((Β¬ 𝑠 ≀ π‘Š ∧ 𝑠 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))))
 
Theoremcdlemefs29cpre1N 38767* TODO: FIX COMMENT. (Contributed by NM, 26-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ βˆƒ!𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 (((Β¬ 𝑠 ≀ π‘Š ∧ 𝑠 ≀ (𝑃 ∨ 𝑄)) ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))))
 
Theoremcdlemefs29clN 38768* Show closure of the unique element in cdleme29c 38725. (Contributed by NM, 27-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (𝑅 ∧ π‘Š)) = 𝑅) β†’ 𝑧 = (𝑁 ∨ (𝑅 ∧ π‘Š))))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑂 ∈ 𝐡)
 
Theoremcdleme43fsv1snlem 38769* Value of ⦋𝑅 / π‘ β¦Œπ‘ when 𝑅 ≀ (𝑃 ∨ 𝑄). (Contributed by NM, 30-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘Œ = ((𝑆 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑆) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (π‘Œ ∨ ((𝑅 ∨ 𝑆) ∧ π‘Š)))    &   π‘‰ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑅 ∨ 𝑑) ∧ π‘Š)))    &   π‘‹ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝑉))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š)) ∧ (𝑅 ≀ (𝑃 ∨ 𝑄) ∧ Β¬ 𝑆 ≀ (𝑃 ∨ 𝑄))) β†’ ⦋𝑅 / π‘ β¦Œπ‘ = 𝑍)
 
Theoremcdleme43fsv1sn 38770* Value of ⦋𝑅 / π‘ β¦Œπ‘ when 𝑅 ≀ (𝑃 ∨ 𝑄). (Contributed by NM, 30-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘Œ = ((𝑆 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑆) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (π‘Œ ∨ ((𝑅 ∨ 𝑆) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š)) ∧ (𝑅 ≀ (𝑃 ∨ 𝑄) ∧ Β¬ 𝑆 ≀ (𝑃 ∨ 𝑄))) β†’ ⦋𝑅 / π‘ β¦Œπ‘ = 𝑍)
 
Theoremcdlemefs32fvaN 38771* Part of proof of Lemma E in [Crawley] p. 113. Value of 𝐹 at an atom not under π‘Š. TODO: FIX COMMENT. TODO: consolidate uses of lhpmat 38379 here and elsewhere, and presence/absence of 𝑠 ≀ (𝑃 ∨ 𝑄) term. Also, why can proof be shortened with cdleme27cl 38715? What is difference from cdlemefs27cl 38762? (Contributed by NM, 29-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ ⦋𝑅 / π‘₯β¦Œπ‘‚ = ⦋𝑅 / π‘ β¦Œπ‘)
 
Theoremcdlemefs32fva1 38772* Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT. (Contributed by NM, 29-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (πΉβ€˜π‘…) = ⦋𝑅 / π‘ β¦Œπ‘)
 
Theoremcdlemefs31fv1 38773* Value of (πΉβ€˜π‘…) when 𝑅 ≀ (𝑃 ∨ 𝑄). TODO This may be useful for shortening others that now use riotasv 37307 3d . TODO: FIX COMMENT. ***END OF VALUE AT ATOM STUFF TO REPLACE ONES BELOW***
       "cdleme3xsn1aw" decreased using "cdlemefs32sn1aw"
       "cdleme32sn1aw" decreased from 3302 to 36 using "cdlemefs32sn1aw".
       "cdleme32sn2aw" decreased from 1687 to 26 using "cdlemefr32sn2aw".
       "cdleme32snaw" decreased from 376 to 375 using "cdlemefs32sn1aw".
       "cdleme32snaw" decreased from 375 to 368 using "cdlemefr32sn2aw".
       "cdleme35sn3a" decreased from 547 to 523 using "cdleme43frv1sn".
       
(Contributed by NM, 27-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    &   π‘Œ = ((𝑆 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑆) ∧ π‘Š)))    &   π‘ = ((𝑃 ∨ 𝑄) ∧ (π‘Œ ∨ ((𝑅 ∨ 𝑆) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š)) ∧ (𝑅 ≀ (𝑃 ∨ 𝑄) ∧ Β¬ 𝑆 ≀ (𝑃 ∨ 𝑄))) β†’ (πΉβ€˜π‘…) = 𝑍)
 
Theoremcdlemefr44 38774* Value of f(r) when r is an atom not under pq, using more compact hypotheses. TODO: eliminate and use cdlemefr45 instead? TODO: FIX COMMENT. (Contributed by NM, 31-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, ⦋𝑠 / π‘‘β¦Œπ·) ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (πΉβ€˜π‘…) = ⦋𝑅 / π‘‘β¦Œπ·)
 
Theoremcdlemefs44 38775* Value of fs(r) when r is an atom under pq and s is any atom not under pq, using more compact hypotheses. TODO: eliminate and use cdlemefs45 38778 instead TODO: FIX COMMENT. (Contributed by NM, 31-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, ⦋𝑠 / π‘‘β¦Œπ·) ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š)) ∧ (𝑅 ≀ (𝑃 ∨ 𝑄) ∧ Β¬ 𝑆 ≀ (𝑃 ∨ 𝑄))) β†’ (πΉβ€˜π‘…) = ⦋𝑅 / π‘ β¦Œβ¦‹π‘† / π‘‘β¦ŒπΈ)
 
Theoremcdlemefr45 38776* Value of f(r) when r is an atom not under pq, using very compact hypotheses. TODO: FIX COMMENT. (Contributed by NM, 1-Apr-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (if(𝑠 ≀ (𝑃 ∨ 𝑄), (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸)), ⦋𝑠 / π‘‘β¦Œπ·) ∨ (π‘₯ ∧ π‘Š)))), π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (πΉβ€˜π‘…) = ⦋𝑅 / π‘‘β¦Œπ·)
 
Theoremcdlemefr45e 38777* Explicit expansion of cdlemefr45 38776. TODO: use to shorten cdlemefr45 38776 uses? TODO: FIX COMMENT. (Contributed by NM, 10-Apr-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (if(𝑠 ≀ (𝑃 ∨ 𝑄), (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸)), ⦋𝑠 / π‘‘β¦Œπ·) ∨ (π‘₯ ∧ π‘Š)))), π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (πΉβ€˜π‘…) = ((𝑅 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š))))
 
Theoremcdlemefs45 38778* Value of fs(r) when r is an atom under pq and s is any atom not under pq, using very compact hypotheses. TODO: FIX COMMENT. (Contributed by NM, 1-Apr-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (if(𝑠 ≀ (𝑃 ∨ 𝑄), (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸)), ⦋𝑠 / π‘‘β¦Œπ·) ∨ (π‘₯ ∧ π‘Š)))), π‘₯))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š)) ∧ (𝑅 ≀ (𝑃 ∨ 𝑄) ∧ Β¬ 𝑆 ≀ (𝑃 ∨ 𝑄))) β†’ (πΉβ€˜π‘…) = ⦋𝑅 / π‘ β¦Œβ¦‹π‘† / π‘‘β¦ŒπΈ)
 
Theoremcdlemefs45ee 38779* Explicit expansion of cdlemefs45 38778. TODO: use to shorten cdlemefs45 38778 uses? Should ((𝑆 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑆) ∧ π‘Š))) be assigned to a hypothesis letter? TODO: FIX COMMENT. (Contributed by NM, 10-Apr-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (if(𝑠 ≀ (𝑃 ∨ 𝑄), (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸)), ⦋𝑠 / π‘‘β¦Œπ·) ∨ (π‘₯ ∧ π‘Š)))), π‘₯))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š)) ∧ (𝑅 ≀ (𝑃 ∨ 𝑄) ∧ Β¬ 𝑆 ≀ (𝑃 ∨ 𝑄))) β†’ (πΉβ€˜π‘…) = ((𝑃 ∨ 𝑄) ∧ (((𝑆 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑆) ∧ π‘Š))) ∨ ((𝑅 ∨ 𝑆) ∧ π‘Š))))
 
Theoremcdlemefs45eN 38780* Explicit expansion of cdlemefs45 38778. TODO: use to shorten cdlemefs45 38778 uses? TODO: FIX COMMENT. (Contributed by NM, 10-Apr-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (if(𝑠 ≀ (𝑃 ∨ 𝑄), (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸)), ⦋𝑠 / π‘‘β¦Œπ·) ∨ (π‘₯ ∧ π‘Š)))), π‘₯))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ (𝑆 ∈ 𝐴 ∧ Β¬ 𝑆 ≀ π‘Š)) ∧ (𝑅 ≀ (𝑃 ∨ 𝑄) ∧ Β¬ 𝑆 ≀ (𝑃 ∨ 𝑄))) β†’ (πΉβ€˜π‘…) = ((𝑃 ∨ 𝑄) ∧ ((πΉβ€˜π‘†) ∨ ((𝑅 ∨ 𝑆) ∧ π‘Š))))
 
Theoremcdleme32sn1awN 38781* Show that ⦋𝑅 / π‘ β¦Œπ‘ is an atom not under π‘Š when 𝑅 ≀ (𝑃 ∨ 𝑄). (Contributed by NM, 6-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘Œ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑅 ∨ 𝑑) ∧ π‘Š)))    &   π‘ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = π‘Œ))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐴 ∧ Β¬ ⦋𝑅 / π‘ β¦Œπ‘ ≀ π‘Š))
 
Theoremcdleme41sn3a 38782* Show that ⦋𝑅 / π‘ β¦Œπ‘ is under 𝑃 ∨ 𝑄 when 𝑅 ≀ (𝑃 ∨ 𝑄). (Contributed by NM, 19-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘Œ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑅 ∨ 𝑑) ∧ π‘Š)))    &   π‘ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = π‘Œ))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ ⦋𝑅 / π‘ β¦Œπ‘ ≀ (𝑃 ∨ 𝑄))
 
Theoremcdleme32sn2awN 38783* Show that ⦋𝑅 / π‘ β¦Œπ‘ is an atom not under π‘Š when Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄). (Contributed by NM, 6-Mar-2013.) (New usage is discouraged.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐴 ∧ Β¬ ⦋𝑅 / π‘ β¦Œπ‘ ≀ π‘Š))
 
Theoremcdleme32snaw 38784* Show that ⦋𝑅 / π‘ β¦Œπ‘ is an atom not under π‘Š. (Contributed by NM, 6-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š))) β†’ (⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐴 ∧ Β¬ ⦋𝑅 / π‘ β¦Œπ‘ ≀ π‘Š))
 
Theoremcdleme32snb 38785* Show closure of ⦋𝑅 / π‘ β¦Œπ‘. (Contributed by NM, 1-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š))) β†’ ⦋𝑅 / π‘ β¦Œπ‘ ∈ 𝐡)
 
Theoremcdleme32fva 38786* Part of proof of Lemma D in [Crawley] p. 113. Value of 𝐹 at an atom not under π‘Š. (Contributed by NM, 2-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ 𝑃 β‰  𝑄) β†’ ⦋𝑅 / π‘₯β¦Œπ‘‚ = ⦋𝑅 / π‘ β¦Œπ‘)
 
Theoremcdleme32fva1 38787* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 2-Mar-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š) ∧ 𝑃 β‰  𝑄) β†’ (πΉβ€˜π‘…) = ⦋𝑅 / π‘ β¦Œπ‘)
 
Theoremcdleme32fvaw 38788* Show that (πΉβ€˜π‘…) is an atom not under π‘Š when 𝑅 is an atom not under π‘Š. (Contributed by NM, 18-Apr-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) β†’ ((πΉβ€˜π‘…) ∈ 𝐴 ∧ Β¬ (πΉβ€˜π‘…) ≀ π‘Š))
 
Theoremcdleme32fvcl 38789* Part of proof of Lemma D in [Crawley] p. 113. Closure of the function 𝐹. (Contributed by NM, 10-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ 𝑋 ∈ 𝐡) β†’ (πΉβ€˜π‘‹) ∈ 𝐡)
 
Theoremcdleme32a 38790* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 19-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑋 ∈ 𝐡 ∧ (𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š)) ∧ ((𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š) ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋)) β†’ (πΉβ€˜π‘‹) = (𝑁 ∨ (𝑋 ∧ π‘Š)))
 
Theoremcdleme32b 38791* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 19-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑋 ∈ 𝐡 ∧ π‘Œ ∈ 𝐡 ∧ (𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š)) ∧ ((𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š) ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋 ∧ 𝑋 ≀ π‘Œ)) β†’ (πΉβ€˜π‘Œ) = (𝑁 ∨ (π‘Œ ∧ π‘Š)))
 
Theoremcdleme32c 38792* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 19-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑋 ∈ 𝐡 ∧ π‘Œ ∈ 𝐡 ∧ (𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š)) ∧ ((𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š) ∧ (𝑠 ∨ (𝑋 ∧ π‘Š)) = 𝑋 ∧ 𝑋 ≀ π‘Œ)) β†’ (πΉβ€˜π‘‹) ≀ (πΉβ€˜π‘Œ))
 
Theoremcdleme32d 38793* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 20-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑋 ∈ 𝐡 ∧ π‘Œ ∈ 𝐡 ∧ (𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š)) ∧ 𝑋 ≀ π‘Œ) β†’ (πΉβ€˜π‘‹) ≀ (πΉβ€˜π‘Œ))
 
Theoremcdleme32e 38794* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 20-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ ((𝑋 ∈ 𝐡 ∧ π‘Œ ∈ 𝐡) ∧ Β¬ (𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š) ∧ (𝑃 β‰  𝑄 ∧ Β¬ π‘Œ ≀ π‘Š)) ∧ ((𝑠 ∈ 𝐴 ∧ Β¬ 𝑠 ≀ π‘Š) ∧ (𝑠 ∨ (π‘Œ ∧ π‘Š)) = π‘Œ ∧ 𝑋 ≀ π‘Œ)) β†’ (πΉβ€˜π‘‹) ≀ (πΉβ€˜π‘Œ))
 
Theoremcdleme32f 38795* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 20-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ ((𝑋 ∈ 𝐡 ∧ π‘Œ ∈ 𝐡) ∧ Β¬ (𝑃 β‰  𝑄 ∧ Β¬ 𝑋 ≀ π‘Š) ∧ (𝑃 β‰  𝑄 ∧ Β¬ π‘Œ ≀ π‘Š)) ∧ 𝑋 ≀ π‘Œ) β†’ (πΉβ€˜π‘‹) ≀ (πΉβ€˜π‘Œ))
 
Theoremcdleme32le 38796* Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 20-Feb-2013.)
𝐡 = (Baseβ€˜πΎ)    &    ≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΆ = ((𝑠 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑠) ∧ π‘Š)))    &   π· = ((𝑑 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑑) ∧ π‘Š)))    &   πΈ = ((𝑃 ∨ 𝑄) ∧ (𝐷 ∨ ((𝑠 ∨ 𝑑) ∧ π‘Š)))    &   πΌ = (℩𝑦 ∈ 𝐡 βˆ€π‘‘ ∈ 𝐴 ((Β¬ 𝑑 ≀ π‘Š ∧ Β¬ 𝑑 ≀ (𝑃 ∨ 𝑄)) β†’ 𝑦 = 𝐸))    &   π‘ = if(𝑠 ≀ (𝑃 ∨ 𝑄), 𝐼, 𝐢)    &   π‘‚ = (℩𝑧 ∈ 𝐡 βˆ€π‘  ∈ 𝐴 ((Β¬ 𝑠 ≀ π‘Š ∧ (𝑠 ∨ (π‘₯ ∧ π‘Š)) = π‘₯) β†’ 𝑧 = (𝑁 ∨ (π‘₯ ∧ π‘Š))))    &   πΉ = (π‘₯ ∈ 𝐡 ↦ if((𝑃 β‰  𝑄 ∧ Β¬ π‘₯ ≀ π‘Š), 𝑂, π‘₯))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑋 ∈ 𝐡 ∧ π‘Œ ∈ 𝐡) ∧ 𝑋 ≀ π‘Œ) β†’ (πΉβ€˜π‘‹) ≀ (πΉβ€˜π‘Œ))
 
Theoremcdleme35a 38797 Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT. (Contributed by NM, 10-Mar-2013.)
≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑅 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (𝐹 ∨ π‘ˆ) = (𝑅 ∨ π‘ˆ))
 
Theoremcdleme35fnpq 38798 Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT. (Contributed by NM, 19-Mar-2013.)
≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑅 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ Β¬ 𝐹 ≀ (𝑃 ∨ 𝑄))
 
Theoremcdleme35b 38799 Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT. (Contributed by NM, 10-Mar-2013.)
≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑅 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)) ≀ (𝑄 ∨ (𝑅 ∨ π‘ˆ)))
 
Theoremcdleme35c 38800 Part of proof of Lemma E in [Crawley] p. 113. TODO: FIX COMMENT. (Contributed by NM, 10-Mar-2013.)
≀ = (leβ€˜πΎ)    &    ∨ = (joinβ€˜πΎ)    &    ∧ = (meetβ€˜πΎ)    &   π΄ = (Atomsβ€˜πΎ)    &   π» = (LHypβ€˜πΎ)    &   π‘ˆ = ((𝑃 ∨ 𝑄) ∧ π‘Š)    &   πΉ = ((𝑅 ∨ π‘ˆ) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)))    β‡’   ((((𝐾 ∈ HL ∧ π‘Š ∈ 𝐻) ∧ (𝑃 ∈ 𝐴 ∧ Β¬ 𝑃 ≀ π‘Š) ∧ (𝑄 ∈ 𝐴 ∧ Β¬ 𝑄 ≀ π‘Š)) ∧ (𝑃 β‰  𝑄 ∧ (𝑅 ∈ 𝐴 ∧ Β¬ 𝑅 ≀ π‘Š)) ∧ Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄)) β†’ (𝑄 ∨ 𝐹) = (𝑄 ∨ ((𝑃 ∨ 𝑅) ∧ π‘Š)))
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268 26701-26800 269 26801-26900 270 26901-27000 271 27001-27100 272 27101-27200 273 27201-27300 274 27301-27400 275 27401-27500 276 27501-27600 277 27601-27700 278 27701-27800 279 27801-27900 280 27901-28000 281 28001-28100 282 28101-28200 283 28201-28300 284 28301-28400 285 28401-28500 286 28501-28600 287 28601-28700 288 28701-28800 289 28801-28900 290 28901-29000 291 29001-29100 292 29101-29200 293 29201-29300 294 29301-29400 295 29401-29500 296 29501-29600 297 29601-29700 298 29701-29800 299 29801-29900 300 29901-30000 301 30001-30100 302 30101-30200 303 30201-30300 304 30301-30400 305 30401-30500 306 30501-30600 307 30601-30700 308 30701-30800 309 30801-30900 310 30901-31000 311 31001-31100 312 31101-31200 313 31201-31300 314 31301-31400 315 31401-31500 316 31501-31600 317 31601-31700 318 31701-31800 319 31801-31900 320 31901-32000 321 32001-32100 322 32101-32200 323 32201-32300 324 32301-32400 325 32401-32500 326 32501-32600 327 32601-32700 328 32701-32800 329 32801-32900 330 32901-33000 331 33001-33100 332 33101-33200 333 33201-33300 334 33301-33400 335 33401-33500 336 33501-33600 337 33601-33700 338 33701-33800 339 33801-33900 340 33901-34000 341 34001-34100 342 34101-34200 343 34201-34300 344 34301-34400 345 34401-34500 346 34501-34600 347 34601-34700 348 34701-34800 349 34801-34900 350 34901-35000 351 35001-35100 352 35101-35200 353 35201-35300 354 35301-35400 355 35401-35500 356 35501-35600 357 35601-35700 358 35701-35800 359 35801-35900 360 35901-36000 361 36001-36100 362 36101-36200 363 36201-36300 364 36301-36400 365 36401-36500 366 36501-36600 367 36601-36700 368 36701-36800 369 36801-36900 370 36901-37000 371 37001-37100 372 37101-37200 373 37201-37300 374 37301-37400 375 37401-37500 376 37501-37600 377 37601-37700 378 37701-37800 379 37801-37900 380 37901-38000 381 38001-38100 382 38101-38200 383 38201-38300 384 38301-38400 385 38401-38500 386 38501-38600 387 38601-38700 388 38701-38800 389 38801-38900 390 38901-39000 391 39001-39100 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