Mathematics, 10.07.2019 04:20 ChaseRussell24

Let sn, k denote the number of ways to partition an n-element set into exactly k nonempty subsets. the order of the subsets is not taken into account. (the numbers sn, k are called stirling numbers of the second kind.) show that sn, n-1- c(n, 2) for all n 2.

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