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Mathematica® Teacher's Edition (2002)

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NonNegative

FilledSmallSquare NonNegative[x] gives True if x is a nonnegative number.

FilledSmallSquare NonNegative[x] gives False if x is manifestly a negative or complex numerical quantity. Otherwise, it remains unevaluated.
FilledSmallSquare See also: Negative, Positive, Sign, Greater, Simplify.