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Theorem ax1 1431
Description: Standard propositional axiom derived from Lukasiewicz axioms. (Contributed by NM, 22-Dec-2002.) (Proof modification is discouraged.) (New usage is discouraged.)
Ref Expression
ax1 (φ → (ψφ))

Proof of Theorem ax1
StepHypRef Expression
1 luklem5 1427 1 (φ → (ψφ))
Colors of variables: wff setvar class
Syntax hints:  wi 4
This theorem was proved from axioms:  ax-mp 8  ax-meredith 1406
This theorem is referenced by:  weds  5938
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