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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 . (Contributed by Anthony Hart, 14-Aug-2011.) |
Ref | Expression |
---|---|
nbfal |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fal 1291 | . 2 | |
2 | 1 | nbn 647 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wb 103 wfal 1289 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-fal 1290 |
This theorem is referenced by: zfnuleu 3902 |
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