Theorem spvv 1900

Description: Version of spv 1853 with a disjoint variable condition. (Contributed by BJ, 31-May-2019.)

Hypothesis

Ref	Expression
spvv.1	|- ( x = y -> ( ph <-> ps ) )

Assertion

Ref	Expression
spvv	|- ( A. x ph -> ps )

Distinct variable groups:   x, y   ps, x

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

Proof of Theorem spvv

Step	Hyp	Ref	Expression
1		spvv.1	. 2 |- ( x = y -> ( ph <-> ps ) )
2	1	spv 1853	1 |- ( A. x ph -> ps )

Syntax hints:   -> wi 4   <-> wb 104   A.wal 1346

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-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527

This theorem depends on definitions:  df-bi 116  df-nf 1454

This theorem is referenced by:  chvarvv  1901