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Mirrors > Home > MPE Home > Th. List > notnoti | Structured version Visualization version Unicode version |
Description: Infer double negation. (Contributed by NM, 27-Feb-2008.) |
Ref | Expression |
---|---|
negbi.1 |
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Ref | Expression |
---|---|
notnoti |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | negbi.1 |
. 2
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2 | notnot1 126 |
. 2
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3 | 1, 2 | ax-mp 5 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem is referenced by: nbn3 350 fal 1450 ax6dgen 1901 mdegleb 23006 nextnt 31058 amosym1 31079 ifpdfan2 36100 aisbnaxb 38492 |
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