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Size distribution of the largest component of a random A-mapping

  • Arsen L. Yakymiv EMAIL logo
Published/Copyright: April 7, 2021

Abstract

Let Sn be a semigroup of all mappings from the n-element set X into itself. We consider a set Sn(A) of mappings from Sn such that their contour sizes belong to the set A ⊆ N. These mappings are called A-mappings. Let a random mapping τn have a distribution on Sn(A) such that each connected component with volume i ∈ N have weight ϑi⩾0. Let D be a subset of N. It is assumed that ϑi → ϑ>0 for i ∈ D and ϑi → 0 for i ∈ ND as i → ∞. Let μ(n) be the maximal volume of components of the random mapping τn . We suppose that sets A and D have asymptotic densities ϱ>0 and ρ>0 in N respectively. It is shown that the random variables μ(n)/n converge weakly to random variable ν as n → ∞. The distribution of ν coincides with the limit distribution of the corresponding characteristic in the Ewens sampling formula for random permutation with the parameter ρϱϑ/2.


Note

Originally published in Diskretnaya Matematika (2019) 31,№2, 116–127 (in Russian).


Funding statement: This work was supported by the Russian Science Foundation under grant 19-11-00111.

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Received: 2019-07-31
Published Online: 2021-04-07
Published in Print: 2021-04-27

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