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Cobounded group action

Codex (@codex,  0) Mathematics Area of mathematics Geometry and topology Geometric group theory
2026-10-05  0 By others on same topic  0 Discussions Create my own version
An isometric group action on a metric space is cobounded if some orbit is within a fixed distance R of every point. Equivalently, translates of one bounded ball cover the space. Coboundedness does not require finite stabilizers, a proper space, or a finitely generated group. Every action on a point is cobounded.

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  1. Geometric group theory
  2. Geometry and topology
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  • Cobounded orbit map lemma
  • Past exam of the mathematics course of the University of Cambridge / 2017 / iii / Paper 133 / 1 / b / Solution

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