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Mirrors > Home > ILE Home > Th. List > notnoti | Unicode version |
Description: Infer double negation. (Contributed by NM, 27-Feb-2008.) |
Ref | Expression |
---|---|
negbi.1 |
Ref | Expression |
---|---|
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 |
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