Theorem ancri

Description: Deduction conjoining antecedent to right of consequent. (Contributed by NM, 15-Aug-1994)

	Ref	Expression
Hypothesis	ancri.1	$$⊢\phi \to \psi$$
Assertion	ancri	$$⊢\phi \to \left(\psi \wedge \phi \right)$$

Proof

Step	Hyp	Ref	Expression
1		ancri.1	$$⊢\phi \to \psi$$
2		id	$$⊢\phi \to \phi$$
3	1 2	jca	$$⊢\phi \to \left(\psi \wedge \phi \right)$$