The centers and cyclic radicals of generalized Baumslag-Solitar groups (GBS-groups) are studied. Criteria for their non-triviality are found and an algorithm to compute the center and cyclic radical,is given. In addition, for each unimodular GBS-group, a GBS-cover, i.e., a GBS-group in whose underlying graph the weights around each vertex are constant in absolute value, is, constructed. These groups are then characterized by a minimality property.
机构:
PSL Res Univ, CNRS, Dept Math & Applicat, Ecole Normale Super, 45 Rue Ulm, F-75005 Paris, FrancePSL Res Univ, CNRS, Dept Math & Applicat, Ecole Normale Super, 45 Rue Ulm, F-75005 Paris, France
Cuno, Johannes
Sava-Huss, Ecaterina
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机构:
Graz Univ Technol, Inst Discrete Math, Steyrergasse 30-3, A-8010 Graz, AustriaPSL Res Univ, CNRS, Dept Math & Applicat, Ecole Normale Super, 45 Rue Ulm, F-75005 Paris, France