Theorem rspcimedv 2786

Description: Restricted existential specialization, using implicit substitution. (Contributed by Mario Carneiro, 4-Jan-2017.)

Hypotheses

Ref	Expression
rspcimdv.1	|- ( ph -> A e. B )
rspcimedv.2	|- ( ( ph /\ x = A ) -> ( ch -> ps ) )

Assertion

Ref	Expression
rspcimedv	|- ( ph -> ( ch -> E. x e. B ps ) )

Distinct variable groups:   x, A   x, B   ph, x   ch, x

Allowed substitution hint:   ps( x)

Proof of Theorem rspcimedv

Step	Hyp	Ref	Expression
1		rspcimdv.1	. . 3 |- ( ph -> A e. B )
2		simpr 109	. . . . . . 7 |- ( ( ph /\ x = A ) -> x = A )
3	2	eleq1d 2206	. . . . . 6 |- ( ( ph /\ x = A ) -> ( x e. B <-> A e. B ) )
4	3	biimprd 157	. . . . 5 |- ( ( ph /\ x = A ) -> ( A e. B -> x e. B ) )
5		rspcimedv.2	. . . . 5 |- ( ( ph /\ x = A ) -> ( ch -> ps ) )
6	4, 5	anim12d 333	. . . 4 |- ( ( ph /\ x = A ) -> ( ( A e. B /\ ch ) -> ( x e. B /\ ps ) ) )
7	1, 6	spcimedv 2767	. . 3 |- ( ph -> ( ( A e. B /\ ch ) -> E. x ( x e. B /\ ps ) ) )
8	1, 7	mpand 425	. 2 |- ( ph -> ( ch -> E. x ( x e. B /\ ps ) ) )
9		df-rex 2420	. 2 |- ( E. x e. B ps <-> E. x ( x e. B /\ ps ) )
10	8, 9	syl6ibr 161	1 |- ( ph -> ( ch -> E. x e. B ps ) )

Syntax hints:   -> wi 4   /\ wa 103   = wceq 1331   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:  rspcedv  2788