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Computable real function : ウィキペディア英語版
Computable real function
In mathematical logic, specifically computability theory, a function f \colon \mathbb \to \mathbb is ''sequentially computable'' if, for every computable sequence \_^\infty of real numbers, the sequence \_^\infty is also computable.
A function f \colon \mathbb \to \mathbb is ''effectively uniformly continuous'' if there exists a recursive function d \colon \mathbb \to \mathbb such that, if
| x-y| <
then
| f(x) - f(y)| <
A real function is ''computable'' if it is both sequentially computable and effectively uniformly continuous,〔see

These definitions can be generalized to functions of more than one variable or functions only defined on a subset of \mathbb^n. The generalizations of the latter two need not be restated. A suitable generalization of the first definition is:
Let D be a subset of \mathbb^n. A function f \colon D \to \mathbb is ''sequentially computable'' if, for every n-tuplet \left( \_^\infty, \ldots \_^\infty \right) of computable sequences of real numbers such that
(\forall i) \quad (x_, \ldots x_) \in D \qquad ,
the sequence \_^\infty is also computable.
==References==



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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