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.
Positive Number
See also
Negative Number, PositiveExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Positive Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PositiveNumber.html