Theorem brid 38266

Description: Property of the identity binary relation. (Contributed by Peter Mazsa, 18-Dec-2021.)

Assertion

Ref	Expression
brid	⊢ (𝐴 I 𝐵 ↔ 𝐵 I 𝐴)

Proof of Theorem brid

Step	Hyp	Ref	Expression
1		cnvi 6141	. . 3 ⊢ ◡ I = I
2	1	breqi 5129	. 2 ⊢ (𝐴◡ I 𝐵 ↔ 𝐴 I 𝐵)
3		reli 5816	. . 3 ⊢ Rel I
4	3	relbrcnv 6105	. 2 ⊢ (𝐴◡ I 𝐵 ↔ 𝐵 I 𝐴)
5	2, 4	bitr3i 277	1 ⊢ (𝐴 I 𝐵 ↔ 𝐵 I 𝐴)

Syntax hints:   ↔ wb 206   class class class wbr 5123   I cid 5557  ^◡ccnv 5664

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-ext 2706  ax-sep 5276  ax-nul 5286  ax-pr 5412

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1779  df-sb 2064  df-clab 2713  df-cleq 2726  df-clel 2808  df-ral 3051  df-rex 3060  df-rab 3420  df-v 3465  df-dif 3934  df-un 3936  df-ss 3948  df-nul 4314  df-if 4506  df-sn 4607  df-pr 4609  df-op 4613  df-br 5124  df-opab 5186  df-id 5558  df-xp 5671  df-rel 5672  df-cnv 5673

This theorem is referenced by:  ideq2  38267