Theorem bitru

Description: A theorem is equivalent to truth. (Contributed by Mario Carneiro, 9-May-2015)

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

Proof

Step	Hyp	Ref	Expression
1		bitru.1	|- ph
2		tru	|- T.
3	1 2	2th	|- ( ph <-> T. )