Theorem vtocle 2804

Description: Implicit substitution of a class for a setvar variable. (Contributed by NM, 9-Sep-1993.)

Hypotheses

Ref	Expression
vtocle.1	|- A e. _V
vtocle.2	|- ( x = A -> ph )

Assertion

Ref	Expression
vtocle	|- ph

Distinct variable groups:   x, A   ph, x

Proof of Theorem vtocle

Step	Hyp	Ref	Expression
1		vtocle.1	. 2 |- A e. _V
2		vtocle.2	. . 3 |- ( x = A -> ph )
3	2	vtocleg 2801	. 2 |- ( A e. _V -> ph )
4	1, 3	ax-mp 5	1 |- ph

Syntax hints:   -> wi 4   = wceq 1348   e. wcel 2141   _Vcvv 2730

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-5 1440  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-v 2732

This theorem is referenced by:  repizf2  4148  nn0ind-raph  9329