Displaying similar documents to “Combinatorics of partial derivatives.”

Symmetric partitions and pairings

Ferenc Oravecz (2000)

Colloquium Mathematicae

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The lattice of partitions and the sublattice of non-crossing partitions of a finite set are important objects in combinatorics. In this paper another sublattice of the partitions is investigated, which is formed by the symmetric partitions. The measure whose nth moment is given by the number of non-crossing symmetric partitions of n elements is determined explicitly to be the "symmetric" analogue of the free Poisson law.