Theorem disjeq 39408

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 4002	. . 3 ⊢ (𝐴 = 𝐵 → 𝐵 ⊆ 𝐴)
2	1	disjssd 39407	. 2 ⊢ (𝐴 = 𝐵 → ( Disj 𝐴 → Disj 𝐵))
3		eqimss 4001	. . 3 ⊢ (𝐴 = 𝐵 → 𝐴 ⊆ 𝐵)
4	3	disjssd 39407	. 2 ⊢ (𝐴 = 𝐵 → ( Disj 𝐵 → Disj 𝐴))
5	2, 4	impbid 215	1 ⊢ (𝐴 = 𝐵 → ( Disj 𝐴 ↔ Disj 𝐵))

Syntax hints:   → wi 4   ↔ wb 209   = wceq 1567   Disj wdisjALTV 38793

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-11 2198  ax-ext 2741  ax-sep 5259  ax-pr 5405

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-ral 3086  df-rex 3096  df-rab 3423  df-v 3463  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4293  df-if 4491  df-sn 4593  df-pr 4595  df-op 4599  df-br 5112  df-opab 5176  df-id 5557  df-xp 5668  df-rel 5669  df-cnv 5670  df-co 5671  df-dm 5672  df-rn 5673  df-res 5674  df-coss 39075  df-cnvrefrel 39181  df-funALTV 39341  df-disjALTV 39364

This theorem is referenced by:  disjeqi  39409  disjeqd  39410  disjdmqseqeq1  39411