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Theorem mt3d 117
Description: Modus tollens deduction. (Contributed by NM, 26-Mar-1995.)
Hypotheses
Ref Expression
mt3d.1
mt3d.2
Assertion
Ref Expression
mt3d

Proof of Theorem mt3d
StepHypRef Expression
1 mt3d.1 . 2
2 mt3d.2 . . 3
32con1d 116 . 2
41, 3mpd 14 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
This theorem is referenced by:  mt3i  118  nsyl2  119  ecase23d  1285  nnsucelr  4428  enprmaplem5  6080
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