Theorem disjeq 39216

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

Step	Hyp	Ref	Expression
1		eqimss2 3976	. . 3 ⊢ (𝐴 = 𝐵 → 𝐵 ⊆ 𝐴)
2	1	disjssd 39215	. 2 ⊢ (𝐴 = 𝐵 → ( Disj 𝐴 → Disj 𝐵))
3		eqimss 3975	. . 3 ⊢ (𝐴 = 𝐵 → 𝐴 ⊆ 𝐵)
4	3	disjssd 39215	. 2 ⊢ (𝐴 = 𝐵 → ( Disj 𝐵 → Disj 𝐴))
5	2, 4	impbid 214	1 ⊢ (𝐴 = 𝐵 → ( Disj 𝐴 ↔ Disj 𝐵))

Syntax hints:   → wi 4   ↔ wb 208   = wceq 1548   Disj wdisjALTV 38601

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1975  ax-7 2016  ax-8 2123  ax-9 2131  ax-11 2170  ax-ext 2713  ax-sep 5221  ax-pr 5365

This theorem depends on definitions:  df-bi 209  df-an 398  df-or 855  df-3an 1095  df-tru 1551  df-fal 1561  df-ex 1788  df-sb 2075  df-clab 2720  df-cleq 2733  df-clel 2816  df-ral 3056  df-rex 3066  df-rab 3394  df-v 3435  df-dif 3888  df-un 3890  df-in 3892  df-ss 3902  df-nul 4265  df-if 4458  df-sn 4559  df-pr 4561  df-op 4565  df-br 5076  df-opab 5138  df-id 5516  df-xp 5627  df-rel 5628  df-cnv 5629  df-co 5630  df-dm 5631  df-rn 5632  df-res 5633  df-coss 38883  df-cnvrefrel 38989  df-funALTV 39149  df-disjALTV 39172

This theorem is referenced by:  disjeqi  39217  disjeqd  39218  disjdmqseqeq1  39219