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Mirrors > Home > MPE 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 | notnot1 122 | . 2 | |
3 | 1, 2 | ax-mp 5 | 1 |
Colors of variables: wff setvar class |
Syntax hints: -. wn 3 |
This theorem is referenced by: nbn3 348 fal 1402 ax6dgen 1824 mdegleb 22464 nextnt 29870 amosym1 29891 aisbnaxb 32106 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
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