Theorem truorfal 1406

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 1357	. . 3 |- T.
2	1	orci 731	. 2 |- ( T. \/ F. )
3	2	bitru 1365	1 |- ( ( T. \/ F. ) <-> T. )

Syntax hints:   <-> wb 105   \/ wo 708   T. wtru 1354   F. wfal 1358

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709

This theorem depends on definitions:  df-bi 117  df-tru 1356

This theorem is referenced by:  truxorfal  1420