Definition:Strictly Positive/Real Number

Definition
The strictly positive real numbers are the set defined as:
 * $\R_{> 0} := \left\{{x \in \R: x > 0}\right\}$

That is, all the real numbers that are strictly greater than zero.

Also known as
Throughout Euclid's, the term magnitude is universally used for this concept.

It must of course be borne in mind that at that stage in the development of mathematics, neither of the concepts real number nor positive were fully understood except intuitively.