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A set partition of a Set is a collection of disjoint Subsets of
whose Union is
.
The number of partitions of the Set
is called a Bell Number.
See also Bell Number, Block, Restricted Growth String, Stirling Number of the Second Kind
References
Ruskey, F. ``Info About Set Partitions.''
http://sue.csc.uvic.ca/~cos/inf/setp/SetPartitions.html.