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- W4300487788 abstract "We study diagrams associated with a finite simplicial complex K, in various algebraic and topological categories. We relate their colimits to familiar structures in algebra, combinatorics, geometry and topology. These include: right-angled Artin and Coxeter groups (and their complex analogues, which we call circulation groups); Stanley-Reisner algebras and coalgebras; Davis and Januszkiewicz's spaces DJ(K) associated with toric manifolds and their generalisations; and coordinate subspace arrangements. When K is a flag complex, we extend well-known results on Artin and Coxeter groups by confirming that the relevant circulation group is homotopy equivalent to the space of loops $Omega DJ(K)$. We define homotopy colimits for diagrams of topological monoids and topological groups, and show they commute with the formation of classifying spaces in a suitably generalised sense. We deduce that the homotopy colimit of the appropriate diagram of topological groups is a model for $Omega DJ(K)$ for an arbitrary complex K, and that the natural projection onto the original colimit is a homotopy equivalence when K is flag. In this case, the two models are compatible." @default.
- W4300487788 created "2022-10-03" @default.
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- W4300487788 date "2002-02-09" @default.
- W4300487788 modified "2023-09-25" @default.
- W4300487788 title "Colimits, Stanley-Reisner algebras, and loop spaces" @default.
- W4300487788 doi "https://doi.org/10.48550/arxiv.math/0202081" @default.
- W4300487788 hasPublicationYear "2002" @default.
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