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Mathematica® Teacher's Edition (2002)

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TrueQ

FilledSmallSquare TrueQ[expr] yields True if expr is True, and yields False otherwise.

FilledSmallSquare Example: TrueQ[x==y]LongRightArrow.
FilledSmallSquare You can use TrueQ to "assume" that a test fails when its outcome is not clear.
FilledSmallSquare TrueQ[expr] is equivalent to If[expr, True, False, False].
FilledSmallSquare See The Mathematica Book on the web: Section 2.5.8.
FilledSmallSquare See also: If, Condition, SameQ.