Ruth Kellerhals Professor emerita Formerly holder of the Chair of Geometry / Algebra Department of Mathematics University of Fribourg - Switzerland ORCID: 0000-0001-5704-8521

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Research Topics Hyperbolic Geometry, Geometry of Discrete Groups, Geometric Group Theory, Coxeter Groups, Growth, Perron Numbers, Discrete and Convex Geometry, Volumes and Polylogarithms. Contact mail address : Department of Mathematics University of Fribourg Chemin du Musée 23 CH-1700 Fribourg Pérolles Switzerland office : PER23 - 006 Tel. : +41 26 300 9183 email : ruth.kellerhals at unifr.ch