Theorem cofcutrtime1d 28314

Description: If 𝑋 is a timely cut of 𝐴 and 𝐵, then (L‘𝑋) is cofinal with 𝐴. (Contributed by Scott Fenton, 23-Jan-2025.)

Hypotheses

Ref	Expression
cofcutrtimed.1	⊢ (𝜑 → (𝐴 ∪ 𝐵) ⊆ (O‘(bday‘𝑋)))
cofcutrtimed.2	⊢ (𝜑 → 𝐴 <<s 𝐵)
cofcutrtimed.3	⊢ (𝜑 → 𝑋 = (𝐴 |s 𝐵))

Assertion

Ref	Expression
cofcutrtime1d	⊢ (𝜑 → ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ (L‘𝑋)𝑥 ≤s 𝑦)

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝑋,𝑦

Allowed substitution hints:   𝜑(𝑥, 𝑦)   𝐴(𝑦)   𝐵(𝑦)

Proof of Theorem cofcutrtime1d

Dummy variables 𝑧 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		cofcutrtimed.1	. . 3 ⊢ (𝜑 → (𝐴 ∪ 𝐵) ⊆ (O‘(bday‘𝑋)))
2		cofcutrtimed.2	. . 3 ⊢ (𝜑 → 𝐴 <<s 𝐵)
3		cofcutrtimed.3	. . 3 ⊢ (𝜑 → 𝑋 = (𝐴 |s 𝐵))
4		cofcutrtime 28313	. . 3 ⊢ (((𝐴 ∪ 𝐵) ⊆ (O‘(bday‘𝑋)) ∧ 𝐴 <<s 𝐵 ∧ 𝑋 = (𝐴 |s 𝐵)) → (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ (L‘𝑋)𝑥 ≤s 𝑦 ∧ ∀𝑧 ∈ 𝐵 ∃𝑤 ∈ (R‘𝑋)𝑤 ≤s 𝑧))
5	1, 2, 3, 4	syl3anc 1398	. 2 ⊢ (𝜑 → (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ (L‘𝑋)𝑥 ≤s 𝑦 ∧ ∀𝑧 ∈ 𝐵 ∃𝑤 ∈ (R‘𝑋)𝑤 ≤s 𝑧))
6	5	simpld 500	1 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ (L‘𝑋)𝑥 ≤s 𝑦)

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1569  ∀wral 3076  ∃wrex 3086   ⊆ wss 3895   ∪ cun 4149   class class class wbr 5102  ‘cfv 6538  (class class class)co 7420  bdaycbday 27999   ≤s cles 28101   <<s cslts 28143   |s ccuts 28145  Ocold 28209  Lcleft 28211  Rcright 28212

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pow 5326  ax-pr 5390  ax-un 7751

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rmo 3365  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-pss 4014  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-tp 4588  df-op 4590  df-uni 4867  df-int 4907  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-tr 5212  df-id 5545  df-eprel 5550  df-po 5558  df-so 5559  df-fr 5603  df-we 5605  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-pred 6304  df-ord 6365  df-on 6366  df-suc 6368  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-f1 6543  df-fo 6544  df-f1o 6545  df-fv 6546  df-riota 7377  df-ov 7423  df-oprab 7424  df-mpo 7425  df-2nd 8002  df-frecs 8299  df-wrecs 8330  df-recs 8379  df-1o 8476  df-2o 8477  df-no 28000  df-lts 28001  df-bday 28002  df-les 28102  df-slts 28144  df-cuts 28146  df-made 28213  df-old 28214  df-left 28216  df-right 28217

This theorem is used by: (None)