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$s(n,r)$. how would i then show $s(n+ , r)=rs(n, ... combinatorics stirling-numbers asked dec ' at : milton p. silver badges bronze badges votes answers views how many equivalence relations on $\{a,b,c,d,e,f\}$ have $ $ equivalence classes?
my answer is $ $ -- i counted in three cases based on whether the partitions were split - - , - - , or -... combinatorics elementary-set-theory equivalence-relations stirling-numbers asked dec ' at : soulostar silver badges bronze badges votes answers views stirling number second kind, $s(n, n- ) = \...
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