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Theorem nexr 1820
Description: Inference from 19.8a 1718. (Contributed by Jeff Hankins, 26-Jul-2009.)
Hypothesis
Ref Expression
nexr.1  |-  -.  E. x ph
Assertion
Ref Expression
nexr  |-  -.  ph

Proof of Theorem nexr
StepHypRef Expression
1 nexr.1 . 2  |-  -.  E. x ph
2 19.8a 1718 . 2  |-  ( ph  ->  E. x ph )
31, 2mto 167 1  |-  -.  ph
Colors of variables: wff set class
Syntax hints:   -. wn 3   E.wex 1528
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-11 1715
This theorem depends on definitions:  df-bi 177  df-ex 1529
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