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单词 stirling number
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Stirling number
Stirling number n. (also Stirling's number) a member of either of two arrays used in combinatorics, first described by him ( Methodus Differentialis (1730)), spec. (a) the number of ways of arranging the integers 1 to m in n disjoint non-empty ordered sets, the first element of each ordered set being the least; (a Stirling number of the first kind); (b) the number of ways of partitioning the integers 1 to m into n disjoint non-empty sets; (a Stirling number of the second kind).extracted from Stirlingn.3
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