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Theorem ax1hfs 9898
Description: Heyting's formal system Axiom #1 from [Heyting] p. 127. (Contributed by MM, 11-Aug-2018.)
Assertion
Ref Expression
ax1hfs (𝜑 → (𝜑𝜑))

Proof of Theorem ax1hfs
StepHypRef Expression
1 ax-ia3 101 . 2 (𝜑 → (𝜑 → (𝜑𝜑)))
21pm2.43i 43 1 (𝜑 → (𝜑𝜑))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 97
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia3 101
This theorem is referenced by: (None)
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