Theorem e0bi

Description: Elimination rule identical to mpbi . The non-virtual deduction form is the virtual deduction form, which is mpbi . (Contributed by Alan Sare, 15-Jun-2011) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypotheses	e0bi.1	$$⊢\phi$$
	e0bi.2	$$⊢\phi \leftrightarrow \psi$$
Assertion	e0bi	$$⊢\psi$$

Proof

Step	Hyp	Ref	Expression
1		e0bi.1	$$⊢\phi$$
2		e0bi.2	$$⊢\phi \leftrightarrow \psi$$
3	1 2	mpbi	$$⊢\psi$$