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Theorem nbn3 615
Description: Transfer falsehood via equivalence. (Contributed by NM, 11-Sep-2006.)
Hypothesis
Ref Expression
nbn3.1
Assertion
Ref Expression
nbn3

Proof of Theorem nbn3
StepHypRef Expression
1 nbn3.1 . . 3
21notnoti 573 . 2
32nbn 614 1
Colors of variables: wff set class
Syntax hints:   wn 3   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: (None)
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