Logical negation
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Logical negation is an operation on one logical value, typically the value of a proposition, that produces a value of true when its operand is false and a value of false when its operand is true.
The truth table of \(\operatorname{NOT}~ p,\) also written \(\lnot p,\!\) appears below:
| \(p\!\) | \(\lnot p\!\) |
| \(\operatorname{F}\) | \(\operatorname{T}\) |
| \(\operatorname{T}\) | \(\operatorname{F}\) |
The negation of a proposition \(p\!\) may be found notated in various ways in various contexts of application, often merely for typographical convenience. Among these variants are the following:
| \(\text{Notation}\!\) | \(\text{Vocalization}\!\) |
| \(\bar{p}\!\) | \(p\!\) bar |
| \(\tilde{p}\!\) | \(p\!\) tilde |
| \(p'\!\) | \(p\!\) prime \(p\!\) complement |
| \(!p\!\) | bang \(p\!\) |
Syllabus
Focal nodes
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- Logical Negation @ P2P Foundation
- Logical Negation @ Subject Wikis
- Logical Negation @ Wikiversity Beta
Logical operators
Related topics
- Propositional calculus
- Sole sufficient operator
- Truth table
- Universe of discourse
- Zeroth order logic
Relational concepts
Information, Inquiry
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Portions of the above article were adapted from the following sources under the GNU Free Documentation License, under other applicable licenses, or by permission of the copyright holders.
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