Theorem opelresg 5112

Description: Ordered pair membership in a restriction. Exercise 13 of [TakeutiZaring] p. 25. (Contributed by NM, 14-Oct-2005.)

Assertion

Ref	Expression
opelresg	|- ( B e. V -> ( <. A , B >. e. ( C |` D ) <-> ( <. A , B >. e. C /\ A e. D ) ) )

Proof of Theorem opelresg

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		opeq2 3945	. . 3 |- ( y = B -> <. A , y >. = <. A , B >. )
2	1	eleq1d 2470	. 2 |- ( y = B -> ( <. A , y >. e. ( C |` D ) <-> <. A , B >. e. ( C |` D ) ) )
3	1	eleq1d 2470	. . 3 |- ( y = B -> ( <. A , y >. e. C <-> <. A , B >. e. C ) )
4	3	anbi1d 686	. 2 |- ( y = B -> ( ( <. A , y >. e. C /\ A e. D ) <-> ( <. A , B >. e. C /\ A e. D ) ) )
5		vex 2919	. . 3 |- y e. _V
6	5	opelres 5110	. 2 |- ( <. A , y >. e. ( C |` D ) <-> ( <. A , y >. e. C /\ A e. D ) )
7	2, 4, 6	vtoclbg 2972	1 |- ( B e. V -> ( <. A , B >. e. ( C |` D ) <-> ( <. A , B >. e. C /\ A e. D ) ) )

Syntax hints:   -> wi 4   <-> wb 177   /\ wa 359   = wceq 1649   e. wcel 1721   <.cop 3777   |` cres 4839

This theorem is referenced by:  brresg  5113  opelresiOLD  5116  opelresi  5117  issref  5206

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1662  ax-8 1683  ax-14 1725  ax-6 1740  ax-7 1745  ax-11 1757  ax-12 1946  ax-ext 2385  ax-sep 4290  ax-nul 4298  ax-pr 4363

This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-clab 2391  df-cleq 2397  df-clel 2400  df-nfc 2529  df-ne 2569  df-ral 2671  df-rex 2672  df-rab 2675  df-v 2918  df-dif 3283  df-un 3285  df-in 3287  df-ss 3294  df-nul 3589  df-if 3700  df-sn 3780  df-pr 3781  df-op 3783  df-opab 4227  df-xp 4843  df-res 4849