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arxiv: 2210.12951 · v1 · pith:Y7W574ES · submitted 2022-10-24 · math.GR · math.MG

Distances between fixed-point sets in 2-dimensional Euclidean buildings are realised

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classification math.GR math.MG
keywords euclideanbuildingsdimensionalfixed-pointrealisedsetsbuildingcomplete
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We prove that if two finitely generated groups act on a metrically complete 2-dimensional Euclidean building, then the distance between their fixed-point sets is realised. Our proof uses the geometry of Euclidean buildings, which we view as CAT(0) spaces, and properties of ultrapowers of Euclidean buildings.

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