A+ CATEGORY SCIENTIFIC UNIT

A note on almost negative matrices and Gromov-hyperbolic Coxeter groups

Philip Möller Fundamenta Mathematicae MSC: Primary 20F55; Secondary 51F15 DOI: 10.4064/fm262-10-2024 Published online: 12 December 2024

Abstract

We revisit Moussong’s characterization of Gromov-hyperbolic Coxeter groups. Moussong showed that a Coxeter group is Gromov-hyperbolic if and only if it does not contain a subgroup isomorphic to $\mathbb Z^2$. This property can be read off directly from the defining graph. We show that there is a gap in the original argument and provide a workaround.

Authors

  • Philip MöllerDepartment of Mathematics
    Heinrich Heine University Düsseldorf
    40225 Düsseldorf, Germany
    e-mail

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