Theorem bitru

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

	Ref	Expression
Hypothesis	bitru.1	$$⊢\phi$$
Assertion	bitru	$$⊢\phi \leftrightarrow \top$$

Proof

Step	Hyp	Ref	Expression
1		bitru.1	$$⊢\phi$$
2		tru	$$⊢\top$$
3	1 2	2th	$$⊢\phi \leftrightarrow \top$$