Theorem exim 1701

Description: Theorem 19.22 of [Margaris] p. 90. (Contributed by NM, 10-Jan-1993.) (Proof shortened by Wolf Lammen, 4-Jul-2014.)

Assertion

Ref	Expression
exim	|- ( A. x ( ph -> ps ) -> ( E. x ph -> E. x ps ) )

Proof of Theorem exim

Step	Hyp	Ref	Expression
1		id 23	. 2 |- ( ( ph -> ps ) -> ( ph -> ps ) )
2	1	aleximi 1700	1 |- ( A. x ( ph -> ps ) -> ( E. x ph -> E. x ps ) )

Syntax hints:   -> wi 4   A.wal 1435   E.wex 1659

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1665  ax-4 1678

This theorem depends on definitions:  df-bi 188  df-ex 1660

This theorem is referenced by:  eximi  1703  aleximiOLD  1706  19.23v  1810  19.8a  1910  19.8aOLD  1911  19.9ht  1942  19.23tOLD  1967  spimt  2061  elex2  3099  elex22  3100  vtoclegft  3159  spcimgft  3163  bj-axdd2  30967  bj-2exim  30990  bj-exlimh  30998  bj-alequex  31056  bj-spimtv  31066  wl-19.8a  31625  2exim  36380  pm11.71  36399  onfrALTlem2  36564  19.41rg  36569  ax6e2nd  36577  elex2VD  36889  elex22VD  36890  onfrALTlem2VD  36941  19.41rgVD  36954  ax6e2eqVD  36959  ax6e2ndVD  36960  ax6e2ndeqVD  36961  ax6e2ndALT  36982  ax6e2ndeqALT  36983