Theorem brid 35558

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 5995	. . 3 ⊢ ◡ I = I
2	1	breqi 5065	. 2 ⊢ (𝐴◡ I 𝐵 ↔ 𝐴 I 𝐵)
3		reli 5693	. . 3 ⊢ Rel I
4	3	relbrcnv 5965	. 2 ⊢ (𝐴◡ I 𝐵 ↔ 𝐵 I 𝐴)
5	2, 4	bitr3i 279	1 ⊢ (𝐴 I 𝐵 ↔ 𝐵 I 𝐴)

Syntax hints:   ↔ wb 208   class class class wbr 5059   I cid 5454  ^◡ccnv 5549

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2156  ax-12 2172  ax-ext 2793  ax-sep 5196  ax-nul 5203  ax-pr 5322

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3497  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4562  df-pr 4564  df-op 4568  df-br 5060  df-opab 5122  df-id 5455  df-xp 5556  df-rel 5557  df-cnv 5558

This theorem is referenced by:  ideq2  35559