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Mathematica® Teacher's Edition (2002)

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Positive

FilledSmallSquare Positive[x] gives True if x is a positive number.

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