Definition:Positive Real Function
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Definition
Let $I$ be a real interval.
Let $f$ be a real function.
Then $f$ is positive (on $I$) if and only if:
- $\forall x \in I: f \left({x}\right) \ge 0$
Also known as
A positive real function is also described as non-negative in order to avoid confusing with a strictly positive real function.