Theorem ideq 4888

Description: For sets, the identity relation is the same as equality. (Contributed by NM, 13-Aug-1995.)

Hypothesis

Ref	Expression
ideq.1	|- B e. _V

Assertion

Ref	Expression
ideq	|- ( A _I B <-> A = B )

Proof of Theorem ideq

Step	Hyp	Ref	Expression
1		ideq.1	. 2 |- B e. _V
2		ideqg 4887	. 2 |- ( B e. _V -> ( A _I B <-> A = B ) )
3	1, 2	ax-mp 5	1 |- ( A _I B <-> A = B )

Syntax hints:   <-> wb 105   = wceq 1398   e. wcel 2202   _Vcvv 2803   class class class wbr 4093   _I cid 4391

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-br 4094  df-opab 4156  df-id 4396  df-xp 4737  df-rel 4738

This theorem is referenced by:  dmi  4952  resieq  5029  resiexg  5064  iss  5065  restidsing  5075  imai  5099  issref  5126  intasym  5128  asymref  5129  intirr  5130  poirr2  5136  cnvi  5148  coi1  5259  idssen  6993