Theorem falimfal 1343

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

Assertion

Ref	Expression
falimfal	|- ( ( F. -> F. ) <-> T. )

Proof of Theorem falimfal

Step	Hyp	Ref	Expression
1		id 19	. 2 |- ( F. -> F. )
2	1	bitru 1296	1 |- ( ( F. -> F. ) <-> T. )

Syntax hints:   -> wi 4   <-> wb 103   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

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

This theorem is referenced by: (None)