notnoti - Intuitionistic Logic Explorer

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Theorem notnoti 606

Description: Infer double negation. (Contributed by NM, 27-Feb-2008.)

**Hypothesis**
Ref	Expression
negbi.1

**Assertion**
Ref	Expression
notnoti

**Proof of Theorem notnoti**
Step	Hyp	Ref	Expression
1		negbi.1	. 2
2		notnot 591	. 2
3	1, 2	ax-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 576 ax-in2 577

This theorem is referenced by: nbn3 648 fal 1291 ax-9 1464 neirr 2254 dfnul2 3253 dfnul3 3254 rab0 3273