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Theorem ninba 961
Description: Miscellaneous inference relating falsehoods. (Contributed by NM, 31-Mar-1994.)
Hypothesis
Ref Expression
ninba.1
Assertion
Ref Expression
ninba

Proof of Theorem ninba
StepHypRef Expression
1 ninba.1 . . 3
21niabn 951 . 2
32bicomd 201 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  <->wb 184  /\wa 369
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  df-an 371
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