Theorem aistia

Description: Given a is equivalent to T. , there exists a proof for a. (Contributed by Jarvin Udandy, 30-Aug-2016)

	Ref	Expression
Hypothesis	aistia.1	|- ( ph <-> T. )
Assertion	aistia	|- ph

Proof

Step	Hyp	Ref	Expression
1		aistia.1	|- ( ph <-> T. )
2		tbtru	|- ( ph <-> ( ph <-> T. ) )
3	1 2	mpbir	|- ph