Theorem disjeq 39338

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 3997	. . 3 ⊢ (𝐴 = 𝐵 → 𝐵 ⊆ 𝐴)
2	1	disjssd 39337	. 2 ⊢ (𝐴 = 𝐵 → ( Disj 𝐴 → Disj 𝐵))
3		eqimss 3996	. . 3 ⊢ (𝐴 = 𝐵 → 𝐴 ⊆ 𝐵)
4	3	disjssd 39337	. 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 1562   Disj wdisjALTV 38723

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1817  ax-4 1831  ax-5 1932  ax-6 1989  ax-7 2030  ax-8 2146  ax-9 2154  ax-11 2193  ax-ext 2736  ax-sep 5248  ax-pr 5392

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1101  df-tru 1565  df-fal 1575  df-ex 1802  df-sb 2093  df-clab 2743  df-cleq 2756  df-clel 2839  df-ral 3079  df-rex 3089  df-rab 3417  df-v 3458  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5103  df-opab 5165  df-id 5544  df-xp 5655  df-rel 5656  df-cnv 5657  df-co 5658  df-dm 5659  df-rn 5660  df-res 5661  df-coss 39005  df-cnvrefrel 39111  df-funALTV 39271  df-disjALTV 39294

This theorem is referenced by:  disjeqi  39339  disjeqd  39340  disjdmqseqeq1  39341