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Theorem joincom 18217
Description: The join of a poset is commutative. (The antecedent βŸ¨π‘‹, π‘ŒβŸ© ∈ dom ∨ ∧ βŸ¨π‘Œ, π‘‹βŸ© ∈ dom ∨ i.e., "the joins exist" could be omitted as an artifact of our particular join definition, but other definitions may require it.) (Contributed by NM, 16-Sep-2011.) (Revised by NM, 12-Sep-2018.)
Hypotheses
Ref Expression
joincom.b 𝐡 = (Baseβ€˜πΎ)
joincom.j ∨ = (joinβ€˜πΎ)
Assertion
Ref Expression
joincom (((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐡 ∧ π‘Œ ∈ 𝐡) ∧ (βŸ¨π‘‹, π‘ŒβŸ© ∈ dom ∨ ∧ βŸ¨π‘Œ, π‘‹βŸ© ∈ dom ∨ )) β†’ (𝑋 ∨ π‘Œ) = (π‘Œ ∨ 𝑋))

Proof of Theorem joincom
StepHypRef Expression
1 joincom.b . . 3 𝐡 = (Baseβ€˜πΎ)
2 joincom.j . . 3 ∨ = (joinβ€˜πΎ)
31, 2joincomALT 18216 . 2 ((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐡 ∧ π‘Œ ∈ 𝐡) β†’ (𝑋 ∨ π‘Œ) = (π‘Œ ∨ 𝑋))
43adantr 481 1 (((𝐾 ∈ Poset ∧ 𝑋 ∈ 𝐡 ∧ π‘Œ ∈ 𝐡) ∧ (βŸ¨π‘‹, π‘ŒβŸ© ∈ dom ∨ ∧ βŸ¨π‘Œ, π‘‹βŸ© ∈ dom ∨ )) β†’ (𝑋 ∨ π‘Œ) = (π‘Œ ∨ 𝑋))
Colors of variables: wff setvar class
Syntax hints:   β†’ wi 4   ∧ wa 396   ∧ w3a 1086   = wceq 1540   ∈ wcel 2105  βŸ¨cop 4579  dom cdm 5620  β€˜cfv 6479  (class class class)co 7337  Basecbs 17009  Posetcpo 18122  joincjn 18126
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2153  ax-12 2170  ax-ext 2707  ax-rep 5229  ax-sep 5243  ax-nul 5250  ax-pow 5308  ax-pr 5372  ax-un 7650
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2538  df-eu 2567  df-clab 2714  df-cleq 2728  df-clel 2814  df-nfc 2886  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3350  df-rab 3404  df-v 3443  df-sbc 3728  df-csb 3844  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-nul 4270  df-if 4474  df-pw 4549  df-sn 4574  df-pr 4576  df-op 4580  df-uni 4853  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5176  df-id 5518  df-xp 5626  df-rel 5627  df-cnv 5628  df-co 5629  df-dm 5630  df-rn 5631  df-res 5632  df-ima 5633  df-iota 6431  df-fun 6481  df-fn 6482  df-f 6483  df-f1 6484  df-fo 6485  df-f1o 6486  df-fv 6487  df-riota 7293  df-ov 7340  df-oprab 7341  df-lub 18161  df-join 18163
This theorem is referenced by:  latjcom  18262
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