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Theorem ax1hfs 10944
Description: Heyting's formal system Axiom #1 from [Heyting] p. 127. (Contributed by MM, 11-Aug-2018.)
Assertion
Ref Expression
ax1hfs  |-  ( ph  ->  ( ph  /\  ph ) )

Proof of Theorem ax1hfs
StepHypRef Expression
1 ax-ia3 106 . 2  |-  ( ph  ->  ( ph  ->  ( ph  /\  ph ) ) )
21pm2.43i 48 1  |-  ( ph  ->  ( ph  /\  ph ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 102
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia3 106
This theorem is referenced by: (None)
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