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Theorem biort 866
Description: A wff disjoined with truth is true. (Contributed by NM, 23-May-1999.)
Assertion
Ref Expression
biort

Proof of Theorem biort
StepHypRef Expression
1 orc 374 . 2
2 ax-1 6 . 2
31, 2impbid2 195 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wb 176   wo 357
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 177  df-or 359
This theorem is referenced by:  pm5.55  867
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