Theorem truorfal 1341

Description: A \/ identity. (Contributed by Anthony Hart, 22-Oct-2010.)

Assertion

Ref	Expression
truorfal	|- (( T. \/ F. ) <-> T. )

Proof of Theorem truorfal

Step	Hyp	Ref	Expression
1		tru 1321	. . 3 |- T.
2	1	orci 379	. 2 |- ( T. \/ F. )
3	2	bitru 1326	1 |- (( T. \/ F. ) <-> T. )

Syntax hints:   <-> wb 176   \/ wo 357   T. wtru 1316   F. 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)