Theorem falimfal 1347

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 1326	1 |- (( F. -> F. ) <-> T. )

This proof depends on syntax axioms:   -> wi 4   <-> wb 176   T. wtru 1316   F. wfal 1317

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This proof depends on definitions:  df-bi 177  df-tru 1319

This theorem is used by: (None)