Theorem brid 34077

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 5537	. . 3 ⊢ ◡ I = I
2	1	breqi 4659	. 2 ⊢ (𝐴◡ I 𝐵 ↔ 𝐴 I 𝐵)
3		reli 5249	. . 3 ⊢ Rel I
4	3	relbrcnv 5506	. 2 ⊢ (𝐴◡ I 𝐵 ↔ 𝐵 I 𝐴)
5	2, 4	bitr3i 266	1 ⊢ (𝐴 I 𝐵 ↔ 𝐵 I 𝐴)

Syntax hints:   ↔ wb 196   class class class wbr 4653   I cid 5023  ^◡ccnv 5113

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-br 4654  df-opab 4713  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122

This theorem is referenced by:  ideq2  34078