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Theorem disjeq 38719
Description: Equality theorem for disjoints. (Contributed by Peter Mazsa, 22-Sep-2021.)
Assertion
Ref Expression
disjeq (𝐴 = 𝐵 → ( Disj 𝐴 ↔ Disj 𝐵))

Proof of Theorem disjeq
StepHypRef Expression
1 eqimss2 4014 . . 3 (𝐴 = 𝐵𝐵𝐴)
21disjssd 38718 . 2 (𝐴 = 𝐵 → ( Disj 𝐴 → Disj 𝐵))
3 eqimss 4013 . . 3 (𝐴 = 𝐵𝐴𝐵)
43disjssd 38718 . 2 (𝐴 = 𝐵 → ( Disj 𝐵 → Disj 𝐴))
52, 4impbid 212 1 (𝐴 = 𝐵 → ( Disj 𝐴 ↔ Disj 𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206   = wceq 1540   Disj wdisjALTV 38200
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2702  ax-sep 5259  ax-nul 5269  ax-pr 5395
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-clab 2709  df-cleq 2722  df-clel 2804  df-ral 3047  df-rex 3056  df-rab 3412  df-v 3457  df-dif 3925  df-un 3927  df-in 3929  df-ss 3939  df-nul 4305  df-if 4497  df-sn 4598  df-pr 4600  df-op 4604  df-br 5116  df-opab 5178  df-id 5541  df-xp 5652  df-rel 5653  df-cnv 5654  df-co 5655  df-dm 5656  df-rn 5657  df-res 5658  df-coss 38396  df-cnvrefrel 38512  df-funALTV 38667  df-disjALTV 38690
This theorem is referenced by:  disjeqi  38720  disjeqd  38721  disjdmqseqeq1  38722
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