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Limit sets for modules over groups on<i>CAT</i>(0) spaces: from the Euclidean to the hyperbolic
The observation that the zero-dimensional Geometric Invariant ÎŁ 0 ( G ; A ) of BieriâNeumannâStrebelâRenz can be interpreted as a horospherical limit set opens a direct trail from PoincarĂ©Ës limit set Î ( Î ) of a discrete group Î of Möbius transformations (which contains the horospherical limit set âŠ