Theorem ididg 3284

Description: A set is identical to itself.

Assertion

Ref	Expression
ididg	|- (A e. B -> AIA)

Proof of Theorem ididg

Step	Hyp	Ref	Expression
1		breq1 2627	. . 3 |- (x = A -> (xIx <-> AIx))
2		breq2 2628	. . 3 |- (x = A -> (AIx <-> AIA))
3	1, 2	bitrd 530	. 2 |- (x = A -> (xIx <-> AIA))
4		eqid 1478	. . 3 |- x = x
5		visset 1816	. . . 4 |- x e. V
6	5	ideq 3283	. . 3 |- (xIx <-> x = x)
7	4, 6	mpbir 190	. 2 |- xIx
8	3, 7	vtoclg 1850	1 |- (A e. B -> AIA)

Syntax hints:   -> wi 3   = wceq 958   e. wcel 960   class class class wbr 2624  Icid 2837

This theorem is referenced by:  opelxpex2 3285  fvi 3848

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 964  ax-gen 965  ax-8 966  ax-10 968  ax-11 969  ax-12 970  ax-13 971  ax-14 972  ax-17 973  ax-4 975  ax-5o 977  ax-6o 980  ax-9o 1125  ax-10o 1142  ax-16 1212  ax-11o 1220  ax-ext 1462  ax-sep 2708  ax-pow 2748  ax-pr 2785

This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 983  df-sb 1174  df-eu 1384  df-mo 1385  df-clab 1467  df-cleq 1472  df-clel 1475  df-ne 1590  df-v 1815  df-dif 2052  df-un 2053  df-in 2054  df-ss 2056  df-nul 2284  df-pw 2406  df-sn 2416  df-pr 2417  df-op 2420  df-br 2625  df-opab 2672  df-id 2841  df-xp 3190  df-rel 3191

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