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Metamath Proof Explorer

Theorem 19.35ri

Description: Inference associated with 19.35 . (Contributed by NM, 12-Mar-1993)

Ref Expression
Hypothesis 19.35ri.1 
|- ( A. x ph -> E. x ps )
Assertion 19.35ri 
|- E. x ( ph -> ps )

Proof

Step Hyp Ref Expression
1 19.35ri.1 
 |-  ( A. x ph -> E. x ps )
2 19.35 
 |-  ( E. x ( ph -> ps ) <-> ( A. x ph -> E. x ps ) )
3 1 2 mpbir 
 |-  E. x ( ph -> ps )