Abstract
In this chapter we study group actions on metric and topological spaces. Following some general remarks, we shall describe how to construct a group presentation for an arbitrary group Γ acting by homeomorphisms on a simply connected topological space X. If X is a simply connected length space and Γ is acting properly and cocompactly by isometries, then this construction gives a finite presentation for Γ. In order to obtain a more satisfactory description of the relationship between a length space and any group which acts properly and cocompactly by isometries on it, one should regard the group itself as a metric object; in the second part of this chapter we shall explore this idea. The key notion in this regard is quasi-isometry, an equivalence relation among metric spaces that equates spaces which look the same on the large scale (8.14).
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© 1999 Springer-Verlag Berlin Heidelberg
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Bridson, M.R., Haefliger, A. (1999). Group Actions and Quasi-Isometries. In: Metric Spaces of Non-Positive Curvature. Grundlehren der mathematischen Wissenschaften, vol 319. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-12494-9_8
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DOI: https://doi.org/10.1007/978-3-662-12494-9_8
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-08399-0
Online ISBN: 978-3-662-12494-9
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