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Metamath Proof Explorer

Theorem bj-19.21bit

Description: Closed form of 19.21bi . (Contributed by BJ, 20-Oct-2019)

Ref Expression
Assertion bj-19.21bit 
|- ( ( ph -> A. x ps ) -> ( ph -> ps ) )

Proof

Step Hyp Ref Expression
1 sp 
 |-  ( A. x ps -> ps )
2 1 imim2i 
 |-  ( ( ph -> A. x ps ) -> ( ph -> ps ) )