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Theorem notnoti 573
Description: Infer double negation. (Contributed by NM, 27-Feb-2008.)
Hypothesis
Ref Expression
negbi.1
Assertion
Ref Expression
notnoti

Proof of Theorem notnoti
StepHypRef Expression
1 negbi.1 . 2
2 notnot1 559 . 2
31, 2ax-mp 7 1
Colors of variables: wff set class
Syntax hints:   wn 3
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-in1 544  ax-in2 545
This theorem is referenced by:  nbn3  615  fal  1249  ax-9  1421  neirr  2210  dfnul2  3220  dfnul3  3221  rab0  3240
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