Theorem alinexa 1534

Description: A transformation of quantifiers and logical connectives. (Contributed by NM, 19-Aug-1993.)

Assertion

Ref	Expression
alinexa	|- ( A. x ( ph -> -. ps ) <-> -. E. x ( ph /\ ps ) )

Proof of Theorem alinexa

Step	Hyp	Ref	Expression
1		imnan 656	. . 3 |- ( ( ph -> -. ps ) <-> -. ( ph /\ ps ) )
2	1	albii 1399	. 2 |- ( A. x ( ph -> -. ps ) <-> A. x -. ( ph /\ ps ) )
3		alnex 1428	. 2 |- ( A. x -. ( ph /\ ps ) <-> -. E. x ( ph /\ ps ) )
4	2, 3	bitri 182	1 |- ( A. x ( ph -> -. ps ) <-> -. E. x ( ph /\ ps ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 102   <-> wb 103   A.wal 1282   E.wex 1421

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-in1 576  ax-in2 577  ax-5 1376  ax-gen 1378  ax-ie2 1423

This theorem depends on definitions:  df-bi 115  df-tru 1287  df-fal 1290

This theorem is referenced by:  sbnv  1809  ralnex  2358