A note on limits of sequences of binary trees

Autor: Rudolf Grübel
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Discrete Mathematics & Theoretical Computer Science, Vol vol. 25:1, Iss Analysis of Algorithms (2023)
Druh dokumentu: article
ISSN: 1365-8050
DOI: 10.46298/dmtcs.10968
Popis: We discuss a notion of convergence for binary trees that is based on subtree sizes. In analogy to recent developments in the theory of graphs, posets and permutations we investigate some general aspects of the topology, such as a characterization of the set of possible limits and its structure as a metric space. For random trees the subtree size topology arises in the context of algorithms for searching and sorting when applied to random input, resulting in a sequence of nested trees. For these we obtain a structural result based on a local version of exchangeability. This in turn leads to a central limit theorem, with possibly mixed asymptotic normality.
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