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May 16, 2026Forum of Mathematics SigmaOpen Access

An algorithm for uniform generation of unlabeled (Pólya) trees

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Authors

LBLaurent BartholdiPDPersi Diaconis

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Overview

Randomized algorithm generates unlabeled Pólya trees efficiently, suggesting better comparisons with labeled tree statistics.

Key Points

  • To develop an efficient algorithm for generating unlabeled Pólya trees, facilitating better statistical comparisons.
  • Developed an algorithm utilizing the Burnside process for generating Pólya trees.
  • Alternated between creating a uniform permutation and producing labeled rooted trees.
  • Introduced a product formula refining Cayley's approach for counting permutations.
  • Demonstrated conjecturally efficient generation of Pólya trees.
  • Enabled comparison of statistics between unlabeled and labeled trees.
  • Provided a theoretical framework for asymptotic comparisons with practical data.

Cite This Study

Bartholdi et al. (2026) studied this question.

synapsesocial.com/papers/6a080af2a487c87a6a40cfdehttps://doi.org/10.1017/fms.2026.10218
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