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Exterior (topology) : ウィキペディア英語版 | Exterior (topology) In topology, the exterior of a subset ''S'' of a topological space ''X'' is the union of all open sets of ''X'' which are disjoint from ''S''. It is itself an open set and is disjoint from ''S''. The exterior of ''S'' is denoted by :''ext'' ''S'' or :''S''''e''. ==Equivalent definitions== The exterior is equal to ''X'' \ ''S̅'', the complement of the topological closure of ''S'' and to the interior of the complement of ''S'' in ''X''.
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「Exterior (topology)」の詳細全文を読む
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