Theorem 2alimi 1467

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 1466	. 2 |- ( A. y ph -> A. y ps )
3	2	alimi 1466	1 |- ( A. x A. y ph -> A. x A. y ps )

Syntax hints:   -> wi 4   A.wal 1362

This theorem was proved from axioms:  ax-mp 5  ax-5 1458  ax-gen 1460

This theorem is referenced by:  mo23  2083  mo3h  2095  spc2gv  2851  spc3gv  2853  euind  2947  reuind  2965  sbnfc2  3141  opelopabt  4292  ssrel  4747  ssrelrel  4759  fnoprabg  6019