Theorem pm3.4

Description: Conjunction implies implication. Theorem *3.4 of WhiteheadRussell p. 113. (Contributed by NM, 31-Jul-1995)

	Ref	Expression
Assertion	pm3.4	$$⊢\left(\phi \wedge \psi \right)\to \left(\phi \to \psi \right)$$

Proof

Step	Hyp	Ref	Expression
1		simpr	$$⊢\left(\phi \wedge \psi \right)\to \psi$$
2	1	a1d	$$⊢\left(\phi \wedge \psi \right)\to \left(\phi \to \psi \right)$$