Theorem opelco2g 4807

Description: Ordered pair membership in a composition. (Contributed by NM, 27-Jan-1997.) (Revised by Mario Carneiro, 24-Feb-2015.)

Assertion

Ref	Expression
opelco2g	|- ( ( A e. V /\ B e. W ) -> ( <. A , B >. e. ( C o. D ) <-> E. x ( <. A , x >. e. D /\ <. x , B >. e. C ) ) )

Distinct variable groups:   x, A   x, B   x, C   x, D

Allowed substitution hints:   V( x)   W( x)

Proof of Theorem opelco2g

Step	Hyp	Ref	Expression
1		brcog 4806	. 2 |- ( ( A e. V /\ B e. W ) -> ( A ( C o. D ) B <-> E. x ( A D x /\ x C B ) ) )
2		df-br 4016	. 2 |- ( A ( C o. D ) B <-> <. A , B >. e. ( C o. D ) )
3		df-br 4016	. . . 4 |- ( A D x <-> <. A , x >. e. D )
4		df-br 4016	. . . 4 |- ( x C B <-> <. x , B >. e. C )
5	3, 4	anbi12i 460	. . 3 |- ( ( A D x /\ x C B ) <-> ( <. A , x >. e. D /\ <. x , B >. e. C ) )
6	5	exbii 1615	. 2 |- ( E. x ( A D x /\ x C B ) <-> E. x ( <. A , x >. e. D /\ <. x , B >. e. C ) )
7	1, 2, 6	3bitr3g 222	1 |- ( ( A e. V /\ B e. W ) -> ( <. A , B >. e. ( C o. D ) <-> E. x ( <. A , x >. e. D /\ <. x , B >. e. C ) ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   E.wex 1502   e. wcel 2158   <.cop 3607   class class class wbr 4015   o. ccom 4642

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 710  ax-5 1457  ax-7 1458  ax-gen 1459  ax-ie1 1503  ax-ie2 1504  ax-8 1514  ax-10 1515  ax-11 1516  ax-i12 1517  ax-bndl 1519  ax-4 1520  ax-17 1536  ax-i9 1540  ax-ial 1544  ax-i5r 1545  ax-14 2161  ax-ext 2169  ax-sep 4133  ax-pow 4186  ax-pr 4221

This theorem depends on definitions:  df-bi 117  df-3an 981  df-tru 1366  df-nf 1471  df-sb 1773  df-eu 2039  df-mo 2040  df-clab 2174  df-cleq 2180  df-clel 2183  df-nfc 2318  df-v 2751  df-un 3145  df-in 3147  df-ss 3154  df-pw 3589  df-sn 3610  df-pr 3611  df-op 3613  df-br 4016  df-opab 4077  df-co 4647

This theorem is referenced by:  dfco2  5140  dmfco  5597