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Closure (topology)
In mathematics, the closure of a subset ''S'' in a topological space consists of all points in ''S'' plus the limit points of ''S''. The closure of ''S'' is also defined as the union of ''S'' and its boundary. Intuitively, these are all the points in ''S'' and "near" ''S''. A point which is in the closure of ''S'' is a point of closure of ''S''. The notion of closure is in many ways dual to the notion of interior.
==Definitions==
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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