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In mathematics, an indicator function or a characteristic function is a function defined on a set ''X'' that indicates membership of an element in a subset ''A'' of ''X'', having the value 1 for all elements of ''A'' and the value 0 for all elements of ''X'' not in ''A''. It is usually denoted by a bold or blackboard bold 1 symbol with a subscript describing the event of inclusion. ==Definition== The indicator function of a subset ''A'' of a set ''X'' is a function : defined as : The Iverson bracket allows the equivalent notation, , to be used instead of . The function is sometimes denoted , or even just . (The Greek letter appears because it is the initial letter of the Greek word ''characteristic''.) 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「indicator function」の詳細全文を読む スポンサード リンク
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