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Metamath Proof Explorer

Theorem bj-19.23bit

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

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

Proof

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