Theorem truorfal 1337

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 1288	. . 3 |- T.
2	1	orci 682	. 2 |- ( T. \/ F. )
3	2	bitru 1296	1 |- ( ( T. \/ F. ) <-> T. )

Syntax hints:   <-> wb 103   \/ wo 661   T. wtru 1285   F. wfal 1289

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 662

This theorem depends on definitions:  df-bi 115  df-tru 1287

This theorem is referenced by:  truxorfal  1351