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arXiv · 2211.12801

The distribution of the number of automorphisms of random trees

Christoffer Olsson·Stephan Wagner
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Abstract

We study the size of the automorphism group of two different types of random trees: Galton--Watson trees and rooted P\'olya trees. In both cases, we prove that it asymptotically follows a log-normal distribution and provide asymptotic formulas for mean and variance of the logarithm of the size of the automorphism group. While the proof for Galton--Watson trees mainly relies on probabilistic arguments and a general result on additive tree functionals, generating functions are used in the case of rooted P\'olya trees. We also show how to extend the results to some classes of unrooted trees.

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Christoffer Olsson, Stephan Wagner. 2022-11-23. The distribution of the number of automorphisms of random trees. https://arxiv.org/abs/2211.12801

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