Theorem 2alimi 1444

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 1443	. 2 |- ( A. y ph -> A. y ps )
3	2	alimi 1443	1 |- ( A. x A. y ph -> A. x A. y ps )

Syntax hints:   -> wi 4   A.wal 1341

This theorem was proved from axioms:  ax-mp 5  ax-5 1435  ax-gen 1437

This theorem is referenced by:  mo23  2055  mo3h  2067  spc2gv  2817  spc3gv  2819  euind  2913  reuind  2931  sbnfc2  3105  opelopabt  4240  ssrel  4692  ssrelrel  4704  fnoprabg  5943