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Theorem notnoti 143
Description: Inference associated with notnot 142. (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 142 . 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  374  fal  1553  trunorfalOLD  1590  ax6dgen  2124  dfnul2  4259  dfnul2OLD  4261  dfnul4OLD  4263  mdegleb  25229  nexntru  34593  amosym1  34615  bj-ntrufal  34750  ifpdfan2  41070  aisbnaxb  44406
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