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Theorem nexr 1579
Description: Inference from 19.8a 1479. (Contributed by Jeff Hankins, 26-Jul-2009.)
Hypothesis
Ref Expression
nexr.1 ¬ xφ
Assertion
Ref Expression
nexr ¬ φ

Proof of Theorem nexr
StepHypRef Expression
1 nexr.1 . 2 ¬ xφ
2 19.8a 1479 . 2 (φxφ)
31, 2mto 587 1 ¬ φ
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wex 1378
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-4 1397
This theorem depends on definitions:  df-bi 110
This theorem is referenced by: (None)
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