Theorem rspce 2779

Description: Restricted existential specialization, using implicit substitution. (Contributed by NM, 26-May-1998.) (Revised by Mario Carneiro, 11-Oct-2016.)

Hypotheses

Ref	Expression
rspc.1	|- F/ x ps
rspc.2	|- ( x = A -> ( ph <-> ps ) )

Assertion

Ref	Expression
rspce	|- ( ( A e. B /\ ps ) -> E. x e. B ph )

Distinct variable groups:   x, A   x, B

Allowed substitution hints:   ph( x)   ps( x)

Proof of Theorem rspce

Step	Hyp	Ref	Expression
1		nfcv 2279	. . . 4 |- F/_ x A
2		nfv 1508	. . . . 5 |- F/ x A e. B
3		rspc.1	. . . . 5 |- F/ x ps
4	2, 3	nfan 1544	. . . 4 |- F/ x ( A e. B /\ ps )
5		eleq1 2200	. . . . 5 |- ( x = A -> ( x e. B <-> A e. B ) )
6		rspc.2	. . . . 5 |- ( x = A -> ( ph <-> ps ) )
7	5, 6	anbi12d 464	. . . 4 |- ( x = A -> ( ( x e. B /\ ph ) <-> ( A e. B /\ ps ) ) )
8	1, 4, 7	spcegf 2764	. . 3 |- ( A e. B -> ( ( A e. B /\ ps ) -> E. x ( x e. B /\ ph ) ) )
9	8	anabsi5 568	. 2 |- ( ( A e. B /\ ps ) -> E. x ( x e. B /\ ph ) )
10		df-rex 2420	. 2 |- ( E. x e. B ph <-> E. x ( x e. B /\ ph ) )
11	9, 10	sylibr 133	1 |- ( ( A e. B /\ ps ) -> E. x e. B ph )

Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104   = wceq 1331   F/wnf 1436   E.wex 1468   e. wcel 1480   E.wrex 2415

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 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119

This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-rex 2420  df-v 2683

This theorem is referenced by:  rspcev  2784  bezoutlemmain  11675