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Negation is a connective in logic and an operation computing that maps true to false and false to true. It may also refer to:
- Negation (linguistics), a grammatical operation by which a proposition is replaced by one that states the opposite, as by the addition of not
- Negation (comics), a CrossGen comic
- The Negation, an album by the Polish metal band Decapitated
- Negationism, an illegitimate historical revisionist process that minimizes, denies or ignores essential facts
- Negation proper, in various logical and algebraic structures
- Additive inverse, the operation in mathematics that maps positive numbers to negative numbers and vice versa, also known as sign change and opposite number
See also 
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