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Theorem notnotri 114
Description: Inference from double negation. (Contributed by NM, 27-Feb-2008.)
Hypothesis
Ref Expression
notnotri.1
Assertion
Ref Expression
notnotri

Proof of Theorem notnotri
StepHypRef Expression
1 notnotri.1 . 2
2 notnot2 112 . 2
31, 2ax-mp 5 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3
This theorem is referenced by:  mt3  180  pm2.65ni  31439
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
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