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Theorem expt 156
Description: Exportation theorem expressed with primitive connectives. (Contributed by NM, 28-Dec-1992.)
Assertion
Ref Expression
expt

Proof of Theorem expt
StepHypRef Expression
1 pm3.2im 145 . . 3
21imim1d 75 . 2
32com12 31 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
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