Groups acting on semimetric spaces and quasi-isometries of monoids

Robert Gray, Mark Kambites

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10 Citations (Scopus)


We study groups acting by length-preserving transformations on spaces equipped with asymmetric, partially-defined distance functions. We introduce a natural notion of quasi-isometry for such spaces and exhibit an extension of the Švarc-Milnor lemma to this setting. Among the most natural examples of these spaces are finitely generated monoids and semigroups and their Cayley and Schützenberger graphs. We apply our results to show that a number of important properties of monoids are quasi-isometry invariants.
Original languageEnglish
Pages (from-to)555-578
Number of pages24
JournalTransactions of the American Mathematical Society
Issue number2
Early online date24 Sep 2012
Publication statusPublished - 2013

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