Theorem r19.21 2437

Description: Theorem 19.21 of [Margaris] p. 90 with restricted quantifiers. (Contributed by Scott Fenton, 30-Mar-2011.)

Hypothesis

Ref	Expression
r19.21.1	|- F/ x ph

Assertion

Ref	Expression
r19.21	|- ( A. x e. A ( ph -> ps ) <-> ( ph -> A. x e. A ps ) )

Proof of Theorem r19.21

Step	Hyp	Ref	Expression
1		r19.21.1	. 2 |- F/ x ph
2		r19.21t 2436	. 2 |- ( F/ x ph -> ( A. x e. A ( ph -> ps ) <-> ( ph -> A. x e. A ps ) ) )
3	1, 2	ax-mp 7	1 |- ( A. x e. A ( ph -> ps ) <-> ( ph -> A. x e. A ps ) )

Syntax hints:   -> wi 4   <-> wb 103   F/wnf 1389   A.wral 2348

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1376  ax-gen 1378  ax-4 1440  ax-ial 1467  ax-i5r 1468

This theorem depends on definitions:  df-bi 115  df-nf 1390  df-ral 2353

This theorem is referenced by:  r19.21v  2438