Theorem iin1

Description: in1 without virtual deductions. (Contributed by Alan Sare, 23-Jul-2011) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypothesis	iin1.1	$$⊢\phi \to \psi$$
Assertion	iin1	$$⊢\phi \to \psi$$

Proof

Step	Hyp	Ref	Expression
1		iin1.1	$$⊢\phi \to \psi$$