Negation

Negation, in its most basic sense, changes the truth value of a statement to its opposite. It is an operation needed chiefly in logic, mathematics, and grammar.

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In logic, logical negation is a unary logical operator that reverses the truth value of its operand.

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The negation of the statement p is written in various ways:

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• p (which is p with a bar over it)
• ~p
• ¬p
• NOT p

Truth value: In logic, a truth value, or truth-value, is a value indicating to what extent a statement is true....

Logic: Logic (from Classical Greek λόγος (logos), originally meaning the word, or what is spoken, but coming to mean thought or reason) is most often said to be the study of arguments, although the exact definition of logic is a matter of controversy amongst philosophers (see below...

Grammar: :This article is about grammar from a linguistic perspective. For English grammar rules, see English grammar....