Theorem falvar 14103

Description: If something is not true, it outputs F..

Assertion

Ref	Expression
falvar	|- (-. ph <-> (ph <-> F. ))

Proof of Theorem falvar

Step	Hyp	Ref	Expression
1		notfal 1265	. 2 |- -. F.
2	1	nbn 791	1 |- (-. ph <-> (ph <-> F. ))

Syntax hints:  -. wn 2   <-> wb 163   F. wfal 1261

This theorem is referenced by:  bisym1 14243

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7

This theorem depends on definitions:  df-bi 164  df-an 242  df-tru 1262  df-fal 1263

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