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Theorem biort 737
Description: A wff is disjoined with truth is true. (Contributed by NM, 23-May-1999.)
Assertion
Ref Expression
biort

Proof of Theorem biort
StepHypRef Expression
1 orc 632 . 2
2 ax-1 5 . 2
31, 2impbid2 131 1
Colors of variables: wff set class
Syntax hints:   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-io 629
This theorem depends on definitions:  df-bi 110
This theorem is referenced by:  pm5.55dc  818
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