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Theorem truorfal 1341
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
truorfal

Proof of Theorem truorfal
StepHypRef Expression
1 tru 1321 . . 3
21orci 379 . 2
32bitru 1326 1
Colors of variables: wff setvar class
Syntax hints:   wb 176   wo 357   wtru 1316   wfal 1317
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  df-tru 1319
This theorem is referenced by: (None)
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