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Theorem ax3h 27837
Description: Recovery of ax-3 7 from hirstL-ax3 27836. (Contributed by Jarvin Udandy, 3-Jul-2015.)
Assertion
Ref Expression
ax3h  |-  ( ( -.  ph  ->  -.  ps )  ->  ( ps  ->  ph ) )

Proof of Theorem ax3h
StepHypRef Expression
1 ax-3 7 1  |-  ( ( -.  ph  ->  -.  ps )  ->  ( ps  ->  ph ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4
This theorem was proved from axioms:  ax-3 7
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