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Axiom ax-ia3 100
Description: 'And' introduction. Axiom 3 of 10 for intuitionistic logic.
Assertion
Ref Expression
ax-ia3 (φ → (ψ → (φ ψ)))

Detailed syntax breakdown of Axiom ax-ia3
StepHypRef Expression
1 wph . 2 wff φ
2 wps . . 3 wff ψ
31, 2wa 96 . . 3 wff (φ ψ)
42, 3wi 4 . 2 wff (ψ → (φ ψ))
51, 4wi 4 1 wff (φ → (ψ → (φ ψ)))
Colors of variables: wff set class
This axiom is referenced by:  ex  107
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