Axiom ax-ia3 99

Description: 'And' introduction. Axiom 3 of 10 for intuitionistic logic. (Contributed by Mario Carneiro, 31-Jan-2015.)

Assertion

Ref	Expression
ax-ia3	⊢ (φ → (ψ → (φ ∧ ψ)))

Detailed syntax breakdown of Axiom ax-ia3

Step	Hyp	Ref	Expression
1		wph	. 2 wff φ
2		wps	. . 3 wff ψ
3	1, 2	wa 95	. . 3 wff (φ ∧ ψ)
4	2, 3	wi 4	. 2 wff (ψ → (φ ∧ ψ))
5	1, 4	wi 4	1 wff (φ → (ψ → (φ ∧ ψ)))

This axiom is referenced by:  ex  106  pm5.54dc  789  pclem6  1205  xoranor  1208  ax10oe  1564