Definition:Set of All Mappings

Definition
Let $S$ and $T$ be sets.

The set of (all) mappings from $S$ to $T$ is:


 * $T^S := \left\{{f: S \to T: f \ \text{is a mapping}}\right\}$

Also known as
It is sometimes unwieldy to write $T^S$; particularly when $T$ and/or $S$ have themselves superscripts or subscripts attached.

In these cases, it is convenient to write $\left[{S \to T}\right]$ for the set of mappings from $S$ to $T$.