Author(s): Robertson G
Abstract: Let $\Gamma$ be a torsion free discrete group acting cocompactly on a two dimensional euclidean building $\Delta$.The centralizer of an element of $\Gamma$ is either a Bieberbach group or is described by a finite graph of finite cyclic groups.Explicit examples are computed, with $\Delta$ of type $\widetilde A_2$.
Keywords: Group, Centralizer, Euclidean Building
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Professor Guyan Robertson
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