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Mirrors > Home > MPE Home > Th. List > notfal | Structured version Visualization version Unicode version |
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.) |
Ref | Expression |
---|---|
notfal |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fal 1490 | . 2 | |
2 | 1 | bitru 1496 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wb 196 wtru 1484 wfal 1488 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 197 df-tru 1486 df-fal 1489 |
This theorem is referenced by: trunanfal 1525 falnanfal 1527 truxorfal 1529 ifpdfnan 37831 |
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