Theorem axia3

Description: 'And' introduction (intuitionistic logic axiom ax-ia3). (Contributed by Jim Kingdon, 21-May-2018) (New usage is discouraged.)

	Ref	Expression
Assertion	axia3	$$⊢\phi \to \left(\psi \to \left(\phi \wedge \psi \right)\right)$$

Proof

Step	Hyp	Ref	Expression
1		pm3.2	$$⊢\phi \to \left(\psi \to \left(\phi \wedge \psi \right)\right)$$