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Mathematica® Teacher's Edition (2002)

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Not

FilledSmallSquare !expr is the logical NOT function. It gives False if expr is True, and True if it is False.

FilledSmallSquare Not[expr] can be input in most cases as expr. The character can be entered as AliasIndicator!AliasIndicator, AliasIndicatornotAliasIndicator or \[Not].
FilledSmallSquare Not gives symbolic results when necessary, applying various simplification rules to them.
FilledSmallSquare If you are using Mathematica TE with a text-based front end, then you cannot use the notation !expr for Not[expr] if it appears at the very beginning of a line. In this case, !expr is interpreted as a shell escape.
FilledSmallSquare See The Mathematica Book on the web: Section 1.5.6.
FilledSmallSquare See also: LogicalExpand, BitNot, Nor.