Definition:Minimum Value of Real Function/Absolute

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

Let $f$ be bounded below by a infimum $B$.

It may or may not be the case that $\exists x \in S: f \left({x}\right) = B$.

If such a value exists, it is called the minimal value or minimum of $f$ on $S$, and that this minimum is attained at $x$.

Also see

 * Definition:Maximal Value