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- W3089094018 abstract "Abstract We prove that almost all arc complexes do not admit a CAT(0) metric with finitely many shapes, in particular any finite-index subgroup of the mapping class group does not preserve such a metric on the arc complex. We also show the analogous statement for all but finitely many disc complexes of handlebodies and free splitting complexes of free groups. The obstruction is combinatorial. These complexes are all hyperbolic and contractible but despite this we show that they satisfy no combinatorial isoperimetric inequality: for any n there is a loop of length 4 that only bounds discs consisting of at least n triangles. On the other hand we show that the curve complexes satisfy a linear combinatorial isoperimetric inequality, which answers a question of Andrew Putman." @default.
- W3089094018 created "2020-10-01" @default.
- W3089094018 creator A5076595006 @default.
- W3089094018 date "2020-10-01" @default.
- W3089094018 modified "2023-10-17" @default.
- W3089094018 title "Contractible, hyperbolic but non-CAT(0) complexes" @default.
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- W3089094018 doi "https://doi.org/10.1007/s00039-020-00552-2" @default.
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