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Theorem ninba 878
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 873 . 2
32bicomd 129 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wa 97   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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