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Mirrors > Home > ILE Home > Th. List > nbfal | Unicode version |
Description: The negation of a
proposition is equivalent to itself being equivalent to
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Ref | Expression |
---|---|
nbfal |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fal 1360 |
. 2
![]() ![]() ![]() | |
2 | 1 | nbn 699 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 |
This theorem depends on definitions: df-bi 117 df-tru 1356 df-fal 1359 |
This theorem is referenced by: zfnuleu 4127 |
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