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Theorem brid 39244
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
StepHypRef Expression
1 cnvi 5863 . . 3 ◡ I = I
21breqi 5109 . 2 (𝐴◡ I 𝐵 ↔ 𝐴 I 𝐵)
3 reli 5804 . . 3 Rel I
43relbrcnv 6103 . 2 (𝐴◡ I 𝐵 ↔ 𝐵 I 𝐴)
52, 4bitr3i 280 1 (𝐴 I 𝐵 ↔ 𝐵 I 𝐴)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ↔ wb 209   class class class wbr 5103   I cid 5545  ◡ccnv 5650
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659
This theorem is used by:  ideq2  39245
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