# Definition:Negative/Also known as

The notations $R_-$ and $R^-$ are also frequently seen for $\set {x \in R: x \le 0_R}$.
However, these notations are also used to denote $\set {x \in R: x < 0_R}$, that is $R_{< 0_R}$, and hence are ambiguous.
Some treatments of this subject use the term define non-positive to define $x \in R$ where $0_R \le x$, reserving the term negative for what is defined on this website as strictly negative.