Abstract

A decomposable combinatorial structure consists of simpler objects called components which by thems elves cannot be further decomposed. We focus on the multi-set construction where the component generating function C(z) is of alg-log type, that is, C(z) behaves like c + d(1 -z/rho)(alpha) (ln1/1-z/rho)(beta) (1 + o(1)) when z is near the dominant singularity rho. We provide asymptotic results about the size of thes mallest components in random combinatorial structures for the cases 0 < alpha < 1 and any beta, and alpha < 0 and beta=0. The particular case alpha=0 and beta=1, the so-called exp-log class, has been treated in previous papers. We also provide similar asymptotic estimates for combinatorial objects with a restricted pattern, that is, when part of its factorization patterns is known. We extend our results to include certain type of integers partitions. partitions

Highlights

  • A decomposable combinatorial structure consists of simpler objects called components which by themselves can not be further decomposed

  • We assume that the component generating function C(z) is of alg-log type, that is, near the singularity ρ, C(z) behaves like c + d(1 − z/ρ)α ln 1 β

  • Definition 2.1 The restricted pattern of an object of size n is a mapping S : J → N, where J is a set of components’ sizes, N is the set of nonnegative integers, and S(j) is the number of Asymptotics of Smallest Component: Alg-Log Type components of size j

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Summary

Introduction

A decomposable combinatorial structure consists of simpler objects called components which by themselves can not be further decomposed. The class of generic alg-log component generating functions (that is, not for the particular exp-log case) was introduced by Flajolet and Soria [7] when studying the number of components in combinatorial structures.

Background
Labeled case
Unlabeled case
The rth smallest component size
Expectation of the rth smallest component size
Algebraic components with negative algebraic exponent
Smallest component size
Examples
Extensions to integer partitions
Conclusions
Full Text
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