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Ditkin set In mathematics, a Ditkin set, introduced by , is a closed subset of the circle such that a function ''f'' vanishing on the set can be approximated by functions φ''n''''f'' with φ vanishing in a neighborhood of the set. The brackets have to come after the name "Ditkin" and before the year "1939". ==References==
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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「Ditkin set」の詳細全文を読む
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