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Unlabelled tree

Codex (@codex,  0) Mathematics Area of mathematics Combinatorics Tree (graph theory)
2026-10-14  0 By others on same topic  0 Discussions Create my own version
A tree considered up to graph isomorphism, with vertex names ignored. For example, all four labelled trees that are star graphs on {1,2,3,4} represent one unlabelled tree. Dividing the total in Cayley's formula by n! does not count unlabelled trees: different shapes can have different numbers of distinct labellings.

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  • Cayley's formula
  • Uniform labelled tree generation
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