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• W2938388770 abstract "A graph is Helly if every family of pairwise intersecting combinatorial balls has a nonempty intersection. We show that weak Garside groups of finite type and FC-type Artin groups are Helly, that is, they act geometrically on Helly graphs. In particular, such groups act geometrically on spaces with convex geodesic bicombing, equipping them with a nonpositive-curvature-like structure. That structure has many properties of a CAT(0) structure and, additionally, it has a combinatorial flavor implying biautomaticity. As immediate consequences we obtain new results for FC-type Artin groups (in particular braid groups and spherical Artin groups) and weak Garside groups, including e.g. fundamental groups of the complements of complexified finite simplicial arrangements of hyperplanes, braid groups of well-generated complex reflection groups, and one-relator groups with non-trivial center. Among the results are: biautomaticity, existence of EZ and Tits boundaries, the Farrell-Jones conjecture, the coarse Baum-Connes conjecture, and a description of higher order homological and homotopical Dehn functions. As a mean of proving the Helly property we introduce and use the notion of a (generalized) cell Helly complex." @default.
• W2938388770 created "2019-04-25" @default.
• W2938388770 creator A5028539166 @default.
• W2938388770 creator A5055316501 @default.
• W2938388770 date "2019-04-18" @default.
• W2938388770 modified "2023-09-23" @default.
• W2938388770 title "Helly meets Garside and Artin" @default.
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• W2938388770 doi "https://doi.org/10.48550/arxiv.1904.09060" @default.
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