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Theorem cnveq 4929
Description: Equality theorem for converse. (Contributed by NM, 13-Aug-1995.)
Assertion
Ref Expression
cnveq  |-  ( A  =  B  ->  `' A  =  `' B
)

Proof of Theorem cnveq
StepHypRef Expression
1 cnvss 4928 . . 3  |-  ( A 
C_  B  ->  `' A  C_  `' B )
2 cnvss 4928 . . 3  |-  ( B 
C_  A  ->  `' B  C_  `' A )
31, 2anim12i 338 . 2  |-  ( ( A  C_  B  /\  B  C_  A )  -> 
( `' A  C_  `' B  /\  `' B  C_  `' A ) )
4 eqss 3253 . 2  |-  ( A  =  B  <->  ( A  C_  B  /\  B  C_  A ) )
5 eqss 3253 . 2  |-  ( `' A  =  `' B  <->  ( `' A  C_  `' B  /\  `' B  C_  `' A
) )
63, 4, 53imtr4i 201 1  |-  ( A  =  B  ->  `' A  =  `' B
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1398    C_ wss 3211   `'ccnv 4748
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-ext 2214
This theorem depends on definitions:  df-bi 117  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-in 3217  df-ss 3224  df-br 4110  df-opab 4172  df-cnv 4757
This theorem is referenced by:  cnveqi  4930  cnveqd  4931  rneq  4984  cnveqb  5218  funcnvuni  5425  f1eq1  5568  f1ssf1  5646  f1o00  5651  foeqcnvco  5963  tposfn2  6497  ereq1  6774  infeq3  7306  1arith  13065  isrim0  14306  psrbag  14817  psr1clfi  14843  iscn  15062  ishmeo  15169  istrl  16380
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