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Theorem notnoti 137
Description: Inference associated with notnot 136. (Contributed by NM, 27-Feb-2008.)
Hypothesis
Ref Expression
notnoti.1 𝜑
Assertion
Ref Expression
notnoti ¬ ¬ 𝜑

Proof of Theorem notnoti
StepHypRef Expression
1 notnoti.1 . 2 𝜑
2 notnot 136 . 2 (𝜑 → ¬ ¬ 𝜑)
31, 2ax-mp 5 1 ¬ ¬ 𝜑
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem is referenced by:  nbn3  362  fal  1639  ax6dgen  2154  mdegleb  24023  nextnt  32710  amosym1  32731  ifpdfan2  38309  aisbnaxb  41584
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