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Mirrors > Home > NFE Home > Th. List > notnotri | Unicode version |
Description: Inference from double negation. (Contributed by NM, 27-Feb-2008.) |
Ref | Expression |
---|---|
notnotri.1 |
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Ref | Expression |
---|---|
notnotri |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | notnotri.1 |
. 2
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2 | notnot2 104 |
. 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: mt3 171 mtp-xor 1536 |
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