Theorem truorfal 1297

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 1247	. . 3 |- T.
2	1	orci 650	. 2 |- ( T. \/ F. )
3	2	bitru 1255	1 |- ( ( T. \/ F. ) <-> T. )

Syntax hints:   <-> wb 98   \/ wo 629   T. wtru 1244   F. wfal 1248

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 630

This theorem depends on definitions:  df-bi 110  df-tru 1246

This theorem is referenced by:  truxorfal  1311