Stirling number of the second kind
A device that alters the aerodynamics of an airplane, glider etc, allowing it to descend quickly but safely, especially when caught in a thermal
A box used to keep provisions cool
(mathematics) The number of ways to partition a set of n objects into k non-empty subsets, denoted by S(n,k).
A surname.
5要素の集合を2つの空でない部分集合に分割する場合を数えるときは、第二種スターリング数(S(5,2))を計算します。
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