Theorem vtocl3 2820

Description: Implicit substitution of classes for setvar variables. (Contributed by NM, 3-Jun-1995.) (Proof shortened by Andrew Salmon, 8-Jun-2011.)

Hypotheses

Ref	Expression
vtocl3.1	|- A e. _V
vtocl3.2	|- B e. _V
vtocl3.3	|- C e. _V
vtocl3.4	|- ( ( x = A /\ y = B /\ z = C ) -> ( ph <-> ps ) )
vtocl3.5	|- ph

Assertion

Ref	Expression
vtocl3	|- ps

Distinct variable groups:   x, y, z, A   x, B, y, z   x, C, y, z   ps, x, y, z

Allowed substitution hints:   ph( x, y, z)

Proof of Theorem vtocl3

Step	Hyp	Ref	Expression
1		vtocl3.1	. . . . . . 7 |- A e. _V
2	1	isseti 2771	. . . . . 6 |- E. x x = A
3		vtocl3.2	. . . . . . 7 |- B e. _V
4	3	isseti 2771	. . . . . 6 |- E. y y = B
5		vtocl3.3	. . . . . . 7 |- C e. _V
6	5	isseti 2771	. . . . . 6 |- E. z z = C
7		eeeanv 1952	. . . . . . 7 |- ( E. x E. y E. z ( x = A /\ y = B /\ z = C ) <-> ( E. x x = A /\ E. y y = B /\ E. z z = C ) )
8		vtocl3.4	. . . . . . . . . 10 |- ( ( x = A /\ y = B /\ z = C ) -> ( ph <-> ps ) )
9	8	biimpd 144	. . . . . . . . 9 |- ( ( x = A /\ y = B /\ z = C ) -> ( ph -> ps ) )
10	9	eximi 1614	. . . . . . . 8 |- ( E. z ( x = A /\ y = B /\ z = C ) -> E. z ( ph -> ps ) )
11	10	2eximi 1615	. . . . . . 7 |- ( E. x E. y E. z ( x = A /\ y = B /\ z = C ) -> E. x E. y E. z ( ph -> ps ) )
12	7, 11	sylbir 135	. . . . . 6 |- ( ( E. x x = A /\ E. y y = B /\ E. z z = C ) -> E. x E. y E. z ( ph -> ps ) )
13	2, 4, 6, 12	mp3an 1348	. . . . 5 |- E. x E. y E. z ( ph -> ps )
14		nfv 1542	. . . . . . 7 |- F/ z ps
15	14	19.36-1 1687	. . . . . 6 |- ( E. z ( ph -> ps ) -> ( A. z ph -> ps ) )
16	15	2eximi 1615	. . . . 5 |- ( E. x E. y E. z ( ph -> ps ) -> E. x E. y ( A. z ph -> ps ) )
17	13, 16	ax-mp 5	. . . 4 |- E. x E. y ( A. z ph -> ps )
18		nfv 1542	. . . . 5 |- F/ y ps
19	18	19.36-1 1687	. . . 4 |- ( E. y ( A. z ph -> ps ) -> ( A. y A. z ph -> ps ) )
20	17, 19	eximii 1616	. . 3 |- E. x ( A. y A. z ph -> ps )
21	20	19.36aiv 1916	. 2 |- ( A. x A. y A. z ph -> ps )
22		vtocl3.5	. . 3 |- ph
23	22	gen2 1464	. 2 |- A. y A. z ph
24	21, 23	mpg 1465	1 |- ps

Syntax hints:   -> wi 4   <-> wb 105   /\ w3a 980   A.wal 1362   = wceq 1364   E.wex 1506   e. wcel 2167   _Vcvv 2763

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-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-ext 2178

This theorem depends on definitions:  df-bi 117  df-3an 982  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-v 2765

This theorem is referenced by: (None)