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In mathematics, Stirling numbers arise in a variety of analytic and combinatorics problems. They are named after James Stirling, who introduced them in the 18th century. Two different sets of numbers bear this name: the Stirling numbers of the first kind and the Stirling numbers of the second kind. ==Notation== Several different notations for Stirling numbers are in use. Stirling numbers of the first kind are written with a small ''s'', and those of the second kind with a capital ''S''. Stirling numbers of the second kind are never negative, but those of the first kind can be negative; hence, there are notations for the "unsigned Stirling numbers of the first kind", which are Stirling numbers without their signs. Common notations are: : for ordinary (signed) Stirling numbers of the first kind, : 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「Stirling number」の詳細全文を読む スポンサード リンク
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