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Theorem bibif 613
Description: Transfer negation via an equivalence. (Contributed by NM, 3-Oct-2007.) (Proof shortened by Wolf Lammen, 28-Jan-2013.)
Assertion
Ref Expression
bibif

Proof of Theorem bibif
StepHypRef Expression
1 nbn2 612 . 2
2 bicom 128 . 2
31, 2syl6rbb 186 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wb 98
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
This theorem depends on definitions:  df-bi 110
This theorem is referenced by:  nbn  614
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