A positive measure is a measure which is a function from the measurable sets of a measure space to the nonnegative real numbers. Sometimes, this is what is meant by measure, while "positive" is used to distinguish it from an arbitrary complex measure.
Positive Measure
See also
Complex Measure, Jordan Measure Decomposition, Lebesgue Integral, Measure, Measure Space, Polar RepresentationThis entry contributed by Todd Rowland
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Rowland, Todd. "Positive Measure." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/PositiveMeasure.html