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In mathematics, a Frink ideal, introduced by Orrin Frink, is a certain kind of subset of a partially ordered set. == Basic definitions == LU(''A'') is the set of all common lower bounds of the set of all common upper bounds of the subset ''A'' of a partially ordered set. A subset ''I'' of a partially ordered set (''P'', ≤) is a Frink ideal, if the following condition holds: For every finite subset ''S'' of ''P'', ''S'' ''I'' implies that LU(''S'') ''I''. A subset ''I'' of a partially ordered set (''P'',≤) is a normal ideal or a cut if LU(''I'') ''I''. 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「Frink ideal」の詳細全文を読む スポンサード リンク
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