Definition:Support

Let $$f: S \to \R$$ be a real-valued function.

The support of $$f$$ is the set of elements $$x$$ of $$S$$ whose values under $$f$$ are non-zero.

That is:
 * $$\operatorname{supp} \left({f}\right) = \left\{{x \in S: f \left({x}\right) \ne 0}\right\}$$