Definition:Pointwise Operation on Integer-Valued Functions

Definition
Let $S$ be a non-empty set. Let $\Z^S$ be the set of all mappings $f: S \to \Z$, where $\Z$ is the set of integers.

Let $\oplus$ be a binary operation on $\Z$.

Define $\oplus: \Z^S \times \Z^S \to \Z^S$, called pointwise $\oplus$, by:


 * $\forall f, g \in \Z^S: \forall s \in S: \map {\paren {f \oplus g} } s := \map f s \oplus \map g s$

In the above expression, the operator on the is the given $\oplus$ on the integers.

Specific Instantiations
When $\oplus$ has a specific name, it is usual to name the corresponding pointwise operation by prepending pointwise to that name:

Also see
It can be seen that these definitions instantiate the more general Pointwise Operation on Number-Valued Functions.