Theorem 2alimi 1456

Description: Inference doubly quantifying both antecedent and consequent. (Contributed by NM, 3-Feb-2005.)

Hypothesis

Ref	Expression
alimi.1	|- ( ph -> ps )

Assertion

Ref	Expression
2alimi	|- ( A. x A. y ph -> A. x A. y ps )

Proof of Theorem 2alimi

Step	Hyp	Ref	Expression
1		alimi.1	. . 3 |- ( ph -> ps )
2	1	alimi 1455	. 2 |- ( A. y ph -> A. y ps )
3	2	alimi 1455	1 |- ( A. x A. y ph -> A. x A. y ps )

Syntax hints:   -> wi 4   A.wal 1351

This theorem was proved from axioms:  ax-mp 5  ax-5 1447  ax-gen 1449

This theorem is referenced by:  mo23  2067  mo3h  2079  spc2gv  2830  spc3gv  2832  euind  2926  reuind  2944  sbnfc2  3119  opelopabt  4264  ssrel  4716  ssrelrel  4728  fnoprabg  5978