Theorem truvar 14102

Description: If something is true, it outputs T..

Assertion

Ref	Expression
truvar	|- (ph <-> (ph <-> T. ))

Proof of Theorem truvar

Step	Hyp	Ref	Expression
1		tru 1264	. 2 |- T.
2	1	tbt 788	1 |- (ph <-> (ph <-> T. ))

Syntax hints:   <-> wb 163   T. wtru 1260

This theorem is referenced by:  vutr 14285

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

Copyright terms: Public domain