Theorem opelco 4868

Description: Ordered pair membership in a composition. (Contributed by NM, 27-Dec-1996.) (Revised by Mario Carneiro, 24-Feb-2015.)

Hypotheses

Ref	Expression
opelco.1	|- A e. _V
opelco.2	|- B e. _V

Assertion

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

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

Proof of Theorem opelco

Step	Hyp	Ref	Expression
1		df-br 4060	. 2 |- ( A ( C o. D ) B <-> <. A , B >. e. ( C o. D ) )
2		opelco.1	. . 3 |- A e. _V
3		opelco.2	. . 3 |- B e. _V
4	2, 3	brco 4867	. 2 |- ( A ( C o. D ) B <-> E. x ( A D x /\ x C B ) )
5	1, 4	bitr3i 186	1 |- ( <. A , B >. e. ( C o. D ) <-> E. x ( A D x /\ x C B ) )

Syntax hints:   /\ wa 104   <-> wb 105   E.wex 1516   e. wcel 2178   _Vcvv 2776   <.cop 3646   class class class wbr 4059   o. ccom 4697

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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-v 2778  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-br 4060  df-opab 4122  df-co 4702

This theorem is referenced by:  dmcoss  4967  dmcosseq  4969  cotr  5083  coiun  5211  co02  5215  coi1  5217  coass  5220  fmptco  5769  dftpos4  6372