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Combinatorics of Nilpotents in Symmetric Inverse Semigroups

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Abstract

We show how several famous combinatorial sequences appear in the context of nilpotent elements of the full symmetric inverse semigroup \( I \mathcal{S}_n \). These sequences appear either as cardinalities of certain nilpotent subsemigroups or as the numbers of special nilpotent elements and include the Lah numbers, the Bell numbers, the Stirling numbers of the second kind, the binomial coefficients and the Catalan numbers.

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Correspondence to Olexandr Ganyushkin or Volodymyr Mazorchuk.

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AMS Subject Classification: 05A15, 20M18, 20M20, 05A19.

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Ganyushkin, O., Mazorchuk, V. Combinatorics of Nilpotents in Symmetric Inverse Semigroups. Ann. Combin. 8, 161–175 (2004). https://doi.org/10.1007/s00026-004-0213-7

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  • DOI: https://doi.org/10.1007/s00026-004-0213-7

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