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On boundaries of bicombable spaces

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arxiv 2503.06673 v2 pith:EUA6SU7V submitted 2025-03-09 math.GR math.MG

classification math.GRmath.MG
keywords spacesgroupsboundariesconsistentez-structuresactingadmitanalogous
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We initiate systematic study of EZ-structures (and associated boundaries) of groups acting on spaces that admit consistent and conical (equivalently, consistent and convex) geodesic bicombings. Such spaces recently drew a lot of attention due to the fact that many classical groups act `nicely' on them. We rigorously construct EZ-structures, discuss their uniqueness (up to homeomorphism), provide examples, and prove some boundary-related features analogous to the ones exhibited by CAT(0) spaces and groups, which form a subclass of the discussed class of spaces and groups.

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  1. Asymptotically CAT(0) metrics, Z-structures, and the Farrell-Jones Conjecture

    math.GT 2025-04 accept novelty 8.0 of 10

    Colorable hierarchically hyperbolic groups admit asymptotically CAT(0) metrics and Bestvina-Dranishnikov Z-structures, leading to the Farrell-Jones conjecture for extra-large type Artin groups and other new classes.

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