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Theorem nbn3 348
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 123 . 2
32nbn 347 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185
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