Stirling numbers of the second kind

Subdividing a group of (k) students into (n) study groups produces what we call a (n)-partition of the sets of students. The number of these subdivisions is the Stirling number of the second kind ( k) over (or subset) (n) , and is strictly related to the number of (n)-sharings of (lbrace 1,…,krbrace). Let’s see…

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