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This category contains results about the negation operator of propositional logic.
Definitions specific to this category can be found in Definitions/Negation.

The logical not or negation operator is a unary connective whose action is to reverse the truth value of the statement on which it operates.

$\neg p$ is defined as:
$p$ is not true
It is not the case that $p$ is true
It is false that $p$
$p$ is false.

Thus the statement $\neg p$ is called the negation of $p$.

$\neg p$ is voiced not $p$.