Theorem chvar 1803

Description: Implicit substitution of y for x into a theorem. (Contributed by Raph Levien, 9-Jul-2003.) (Revised by Mario Carneiro, 3-Oct-2016.)

Hypotheses

Ref	Expression
chvar.1	|- F/ x ps
chvar.2	|- ( x = y -> ( ph <-> ps ) )
chvar.3	|- ph

Assertion

Ref	Expression
chvar	|- ps

Proof of Theorem chvar

Step	Hyp	Ref	Expression
1		chvar.1	. . 3 |- F/ x ps
2		chvar.2	. . . 4 |- ( x = y -> ( ph <-> ps ) )
3	2	biimpd 144	. . 3 |- ( x = y -> ( ph -> ps ) )
4	1, 3	spim 1784	. 2 |- ( A. x ph -> ps )
5		chvar.3	. 2 |- ph
6	4, 5	mpg 1497	1 |- ps

Syntax hints:   -> wi 4   <-> wb 105   F/wnf 1506

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 1493  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-4 1556  ax-i9 1576  ax-ial 1580

This theorem depends on definitions:  df-bi 117  df-nf 1507

This theorem is referenced by:  csbhypf  3163  opelopabsb  4347  findes  4694  fvmptssdm  5718  dfoprab4f  6337  dom2lem  6921  uzind4s  9781  fsumsplitf  11914