Theorem exanaliim 1696

Description: A transformation of quantifiers and logical connectives. The converse holds in classical but not in intuitionistic logic. (Contributed by Jim Kingdon, 15-Jul-2018.)

Assertion

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

Proof of Theorem exanaliim

Step	Hyp	Ref	Expression
1		annimim 693	. . 3 |- ( ( ph /\ -. ps ) -> -. ( ph -> ps ) )
2	1	eximi 1649	. 2 |- ( E. x ( ph /\ -. ps ) -> E. x -. ( ph -> ps ) )
3		exnalim 1695	. 2 |- ( E. x -. ( ph -> ps ) -> -. A. x ( ph -> ps ) )
4	2, 3	syl 14	1 |- ( E. x ( ph /\ -. ps ) -> -. A. x ( ph -> ps ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   A.wal 1396   E.wex 1541

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-5 1496  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-4 1559  ax-17 1575  ax-ial 1583

This theorem depends on definitions:  df-bi 117  df-tru 1401  df-fal 1404  df-nf 1510

This theorem is referenced by:  rexnalim  2522  nssr  3288  nssssr  4320  brprcneu  5641