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Theorem disjeq 39146
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 3982 . . 3 (𝐴 = 𝐵𝐵𝐴)
21disjssd 39145 . 2 (𝐴 = 𝐵 → ( Disj 𝐴 → Disj 𝐵))
3 eqimss 3981 . . 3 (𝐴 = 𝐵𝐴𝐵)
43disjssd 39145 . 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 1542   Disj wdisjALTV 38531
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-11 2163  ax-ext 2709  ax-sep 5231  ax-pr 5368
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-br 5087  df-opab 5149  df-id 5517  df-xp 5628  df-rel 5629  df-cnv 5630  df-co 5631  df-dm 5632  df-rn 5633  df-res 5634  df-coss 38813  df-cnvrefrel 38919  df-funALTV 39079  df-disjALTV 39102
This theorem is referenced by:  disjeqi  39147  disjeqd  39148  disjdmqseqeq1  39149
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