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Theorem cnveq 4956
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 4955 . . 3  |-  ( A 
C_  B  ->  `' A  C_  `' B )
2 cnvss 4955 . . 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 3263 . 2  |-  ( A  =  B  <->  ( A  C_  B  /\  B  C_  A ) )
5 eqss 3263 . 2  |-  ( `' A  =  `' B  <->  ( `' A  C_  `' B  /\  `' B  C_  `' A
) )
63, 4, 53imtr4i 201 1  |-  ( A  =  B  ->  `' A  =  `' B
)
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ wa 104    = wceq 1402    C_ wss 3220   `'ccnv 4775
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-in 3226  df-ss 3233  df-br 4132  df-opab 4194  df-cnv 4784
This theorem is used by:  cnveqi  4957  cnveqd  4958  rneq  5011  cnveqb  5246  funcnvuni  5453  f1eq1  5596  f1ssf1  5674  f1o00  5679  foeqcnvco  5999  tposfn2  6541  ereq1  6818  infeq3  7361  1arith  13175  isrim0  14577  psrbag  15162  psr1clfi  15198  iscn  15423  ishmeo  15530  istrl  16831
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