A real number for which is said to be a positive number. Positive numbers on their own are usually written without an explicit leading plus sign, but a plus is sometimes prepended () for emphasis or clarity and parallelism in contexts where may be either negative or positive.
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Cite this as:
Weisstein, Eric W. "Positive Number." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/PositiveNumber.html