Theorem bj-19.23bit 31296

Description: Closed form of 19.23bi 1951. (Contributed by BJ, 20-Oct-2019.)

Assertion

Ref	Expression
bj-19.23bit	|- ( ( E. x ph -> ps ) -> ( ph -> ps ) )

Proof of Theorem bj-19.23bit

Step	Hyp	Ref	Expression
1		19.8a 1937	. 2 |- ( ph -> E. x ph )
2	1	imim1i 60	1 |- ( ( E. x ph -> ps ) -> ( ph -> ps ) )

Syntax hints:   -> wi 4   E.wex 1665

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1671  ax-4 1684  ax-5 1760  ax-6 1807  ax-7 1853  ax-12 1935

This theorem depends on definitions:  df-bi 189  df-an 373  df-ex 1666

This theorem is referenced by: (None)