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Restriction (mathematics) : ウィキペディア英語版 | Restriction (mathematics)
In mathematics, the restriction of a function ''f'' is a new function ''f''|A obtained by choosing a smaller domain ''A'' for the original function ''f''. The notation is also used. ==Formal definition== Let be a function from a set to a set , so that the domain of is in (). If a set is a subset of , then the restriction of to is the function〔 〕 :. Informally, the restriction of to is the same function as , but is only defined on . If the function is thought of as a relation on the Cartesian product , then the restriction of to can be represented by the graph , where the pairs represent edges in the graph .
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Restriction (mathematics)」の詳細全文を読む
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