Theorem mpgbi 1387

Description: Modus ponens on biconditional combined with generalization. (Contributed by NM, 24-May-1994.) (Proof shortened by Stefan Allan, 28-Oct-2008.)

Hypotheses

Ref	Expression
mpgbi.1	|- ( A. x ph <-> ps )
mpgbi.2	|- ph

Assertion

Ref	Expression
mpgbi	|- ps

Proof of Theorem mpgbi

Step	Hyp	Ref	Expression
1		mpgbi.2	. . 3 |- ph
2	1	ax-gen 1384	. 2 |- A. x ph
3		mpgbi.1	. 2 |- ( A. x ph <-> ps )
4	2, 3	mpbi 144	1 |- ps

Syntax hints:   <-> wb 104   A.wal 1288

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-gen 1384

This theorem depends on definitions:  df-bi 116

This theorem is referenced by:  nex  1435  exlimih  1530  exan  1629  abbii  2204  bj-ex  11936