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Pointwise
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Pointwise : ウィキペディア英語版
Pointwise
In mathematics, the qualifier pointwise is used to indicate that a certain property is defined by considering each value f(x) of some function f. An important class of pointwise concepts are the ''pointwise operations'' — operations defined on functions by applying the operations to function values separately for each point in the domain of definition. Important relations can also be defined pointwise.
== Pointwise operations ==
Examples include
:
\begin
(f+g)(x) & = f(x)+g(x) & \text \\
(f\cdot g)(x) & = f(x) \cdot g(x) & \text \\
(\lambda f)(x) & = \lambda \cdot f(x) & \text
\end

where f,g:X\to R.
See pointwise product, scalar.
Pointwise operations inherit such properties as associativity, commutativity and distributivity from corresponding operations on the codomain. An example of an operation on functions which is ''not'' pointwise is convolution.
By taking some algebraic structure A in the place of R, we can turn the set of all functions X to the carrier set of A into an algebraic structure of the same type in an analogous way.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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