Theorem falorfal 1398

Description: A \/ identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.)

Assertion

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

Proof of Theorem falorfal

Step	Hyp	Ref	Expression
1		oridm 747	1 |- ( ( F. \/ F. ) <-> F. )

Syntax hints:   <-> wb 104   \/ wo 698   F. wfal 1348

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699

This theorem depends on definitions:  df-bi 116

This theorem is referenced by: (None)