Brady–McCammond's CAT(0) conjecture for the orthoscheme complex of non-crossing partitions
Brady–McCammond's CAT(0) conjecture for the orthoscheme complex of non-crossing partitions
Let be the lattice of non-crossing partitions, and let its orthoscheme complex be its simplicial realisation equipped with the orthoscheme metric obtained by identifying each maximal simplex with the -orthoscheme. Let denote the braid group on strands. Brady–McCammond's conjecture. For every , the orthoscheme complex of is , and consequently the braid group is . This geometric formulation is motivated by the product decomposition of the relevant universal cover and the fact that curvature of the orthoscheme complex would imply the required link condition. The supplied text does not state whether the conjecture has been resolved.
Sources & referencesView supporting material
Primary source
Barbara Baumeister, Kai-Uwe Bux, Friedrich Götze, Dawid Kielak and Henning Krause, “Non-crossing partitions”, arXiv:1903.01146 (2019).
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