Theorem cocnvcnv1 5249

Description: A composition is not affected by a double converse of its first argument. (Contributed by NM, 8-Oct-2007.)

Assertion

Ref	Expression
cocnvcnv1	|- ( `' `' A o. B ) = ( A o. B )

Proof of Theorem cocnvcnv1

Step	Hyp	Ref	Expression
1		cnvcnv2 5192	. . 3 |- `' `' A = ( A |` _V )
2	1	coeq1i 4891	. 2 |- ( `' `' A o. B ) = ( ( A |` _V ) o. B )
3		ssv 3248	. . 3 |- ran B C_ _V
4		cores 5242	. . 3 |- ( ran B C_ _V -> ( ( A |` _V ) o. B ) = ( A o. B ) )
5	3, 4	ax-mp 5	. 2 |- ( ( A |` _V ) o. B ) = ( A o. B )
6	2, 5	eqtri 2251	1 |- ( `' `' A o. B ) = ( A o. B )

Syntax hints:   = wceq 1397   _Vcvv 2801   C_ wss 3199   `'ccnv 4726   ran crn 4728   |` cres 4729   o. ccom 4731

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2204  ax-ext 2212  ax-sep 4208  ax-pow 4266  ax-pr 4301

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ral 2514  df-rex 2515  df-v 2803  df-un 3203  df-in 3205  df-ss 3212  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-br 4090  df-opab 4152  df-xp 4733  df-rel 4734  df-cnv 4735  df-co 4736  df-dm 4737  df-rn 4738  df-res 4739

This theorem is referenced by:  cores2  5251  coires1  5256  cofunex2g  6277