Theorem reupick 3911

Description: Restricted uniqueness "picks" a member of a subclass. (Contributed by NM, 21-Aug-1999.)

Assertion

Ref	Expression
reupick	|- ( ( ( A C_ B /\ ( E. x e. A ph /\ E! x e. B ph ) ) /\ ph ) -> ( x e. A <-> x e. B ) )

Distinct variable groups:   x, A   x, B

Allowed substitution hint:   ph( x)

Proof of Theorem reupick

Step	Hyp	Ref	Expression
1		ssel 3597	. . 3 |- ( A C_ B -> ( x e. A -> x e. B ) )
2	1	ad2antrr 762	. 2 |- ( ( ( A C_ B /\ ( E. x e. A ph /\ E! x e. B ph ) ) /\ ph ) -> ( x e. A -> x e. B ) )
3		df-rex 2918	. . . . . 6 |- ( E. x e. A ph <-> E. x ( x e. A /\ ph ) )
4		df-reu 2919	. . . . . 6 |- ( E! x e. B ph <-> E! x ( x e. B /\ ph ) )
5	3, 4	anbi12i 733	. . . . 5 |- ( ( E. x e. A ph /\ E! x e. B ph ) <-> ( E. x ( x e. A /\ ph ) /\ E! x ( x e. B /\ ph ) ) )
6	1	ancrd 577	. . . . . . . . . . 11 |- ( A C_ B -> ( x e. A -> ( x e. B /\ x e. A ) ) )
7	6	anim1d 588	. . . . . . . . . 10 |- ( A C_ B -> ( ( x e. A /\ ph ) -> ( ( x e. B /\ x e. A ) /\ ph ) ) )
8		an32 839	. . . . . . . . . 10 |- ( ( ( x e. B /\ x e. A ) /\ ph ) <-> ( ( x e. B /\ ph ) /\ x e. A ) )
9	7, 8	syl6ib 241	. . . . . . . . 9 |- ( A C_ B -> ( ( x e. A /\ ph ) -> ( ( x e. B /\ ph ) /\ x e. A ) ) )
10	9	eximdv 1846	. . . . . . . 8 |- ( A C_ B -> ( E. x ( x e. A /\ ph ) -> E. x ( ( x e. B /\ ph ) /\ x e. A ) ) )
11		eupick 2536	. . . . . . . . 9 |- ( ( E! x ( x e. B /\ ph ) /\ E. x ( ( x e. B /\ ph ) /\ x e. A ) ) -> ( ( x e. B /\ ph ) -> x e. A ) )
12	11	ex 450	. . . . . . . 8 |- ( E! x ( x e. B /\ ph ) -> ( E. x ( ( x e. B /\ ph ) /\ x e. A ) -> ( ( x e. B /\ ph ) -> x e. A ) ) )
13	10, 12	syl9 77	. . . . . . 7 |- ( A C_ B -> ( E! x ( x e. B /\ ph ) -> ( E. x ( x e. A /\ ph ) -> ( ( x e. B /\ ph ) -> x e. A ) ) ) )
14	13	com23 86	. . . . . 6 |- ( A C_ B -> ( E. x ( x e. A /\ ph ) -> ( E! x ( x e. B /\ ph ) -> ( ( x e. B /\ ph ) -> x e. A ) ) ) )
15	14	imp32 449	. . . . 5 |- ( ( A C_ B /\ ( E. x ( x e. A /\ ph ) /\ E! x ( x e. B /\ ph ) ) ) -> ( ( x e. B /\ ph ) -> x e. A ) )
16	5, 15	sylan2b 492	. . . 4 |- ( ( A C_ B /\ ( E. x e. A ph /\ E! x e. B ph ) ) -> ( ( x e. B /\ ph ) -> x e. A ) )
17	16	expcomd 454	. . 3 |- ( ( A C_ B /\ ( E. x e. A ph /\ E! x e. B ph ) ) -> ( ph -> ( x e. B -> x e. A ) ) )
18	17	imp 445	. 2 |- ( ( ( A C_ B /\ ( E. x e. A ph /\ E! x e. B ph ) ) /\ ph ) -> ( x e. B -> x e. A ) )
19	2, 18	impbid 202	1 |- ( ( ( A C_ B /\ ( E. x e. A ph /\ E! x e. B ph ) ) /\ ph ) -> ( x e. A <-> x e. B ) )

Syntax hints:   -> wi 4   <-> wb 196   /\ wa 384   E.wex 1704   e. wcel 1990   E!weu 2470   E.wrex 2913   E!wreu 2914   C_ wss 3574

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-rex 2918  df-reu 2919  df-in 3581  df-ss 3588

This theorem is referenced by: (None)