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Theorem biortn 663
Description: A wff is equivalent to its negated disjunction with falsehood. (Contributed by NM, 9-Jul-2012.)
Assertion
Ref Expression
biortn

Proof of Theorem biortn
StepHypRef Expression
1 notnot1 559 . 2
2 biorf 662 . 2
31, 2syl 14 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wb 98   wo 628
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  ax-io 629
This theorem depends on definitions:  df-bi 110
This theorem is referenced by:  oranabs  727
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