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Theorem cnvcnvres 4970
Description: The double converse of the restriction of a class. (Contributed by NM, 3-Jun-2007.)
Assertion
Ref Expression
cnvcnvres  |-  `' `' ( A  |`  B )  =  ( `' `' A  |`  B )

Proof of Theorem cnvcnvres
StepHypRef Expression
1 relres 4815 . . 3  |-  Rel  ( A  |`  B )
2 dfrel2 4957 . . 3  |-  ( Rel  ( A  |`  B )  <->  `' `' ( A  |`  B )  =  ( A  |`  B )
)
31, 2mpbi 144 . 2  |-  `' `' ( A  |`  B )  =  ( A  |`  B )
4 rescnvcnv 4969 . 2  |-  ( `' `' A  |`  B )  =  ( A  |`  B )
53, 4eqtr4i 2139 1  |-  `' `' ( A  |`  B )  =  ( `' `' A  |`  B )
Colors of variables: wff set class
Syntax hints:    = wceq 1314   `'ccnv 4506    |` cres 4509   Rel wrel 4512
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-14 1475  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097  ax-sep 4014  ax-pow 4066  ax-pr 4099
This theorem depends on definitions:  df-bi 116  df-3an 947  df-tru 1317  df-nf 1420  df-sb 1719  df-eu 1978  df-mo 1979  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2245  df-ral 2396  df-rex 2397  df-v 2660  df-un 3043  df-in 3045  df-ss 3052  df-pw 3480  df-sn 3501  df-pr 3502  df-op 3504  df-br 3898  df-opab 3958  df-xp 4513  df-rel 4514  df-cnv 4515  df-res 4519
This theorem is referenced by: (None)
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