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单词 Tangent Number
释义

Tangent Number

英语百科

Alternating permutation

(重定向自Tangent Number)

In combinatorial mathematics, an alternating permutation (or zigzag permutation) of the set {1, 2, 3, ..., n} is an arrangement of those numbers so that each entry is alternately greater or less than the preceding entry. For example, the five alternating permutations of {1, 2, 3, 4} are:

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