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Theorem bianfi 853
Description: A wff conjoined with falsehood is false. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 26-Nov-2012.)
Hypothesis
Ref Expression
bianfi.1
Assertion
Ref Expression
bianfi

Proof of Theorem bianfi
StepHypRef Expression
1 bianfi.1 . 2
21intnan 837 . 2
31, 22false 616 1
Colors of variables: wff set class
Syntax hints:   wn 3   wa 97   wb 98
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  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:  in0  3246  opthprc  4334
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