Theorem imp31

Description: An importation inference. (Contributed by NM, 26-Apr-1994)

	Ref	Expression
Hypothesis	imp31.1	$$⊢\phi \to \left(\psi \to \left(\chi \to \theta \right)\right)$$
Assertion	imp31	$$⊢\left(\left(\phi \wedge \psi \right)\wedge \chi \right)\to \theta$$

Proof

Step	Hyp	Ref	Expression
1		imp31.1	$$⊢\phi \to \left(\psi \to \left(\chi \to \theta \right)\right)$$
2	1	imp	$$⊢\left(\phi \wedge \psi \right)\to \left(\chi \to \theta \right)$$
3	2	imp	$$⊢\left(\left(\phi \wedge \psi \right)\wedge \chi \right)\to \theta$$