MathGloss

The Stirling numbers of the second kind count the number of ways to partition a set of $n$ distinct objects into $k$ indistinct sets, leaving none empty. They are denoted $S(n,k)$.

They also count the number of different equivalence relations with exactly $k$ equivalence classes that can be defined on a set of size $n$.

Wikidata ID: Q2601117

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