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- W2892778911 abstract "We prove that many normal subgroups of the extended mapping class group of a surface with punctures are geometric, that is, that their automorphism groups and abstract commensurator groups are isomorphic to the extended mapping class group. In order to apply our theorem to a normal subgroup we require that the minimal supports of its elements satisfy a certain complexity condition that is easy to check in practice. The key ingredient is proving that the automorphism groups of many simplicial complexes associated to punctured surfaces are isomorphic to the extended mapping class group. This resolves many cases of a metaconjecture of N. V. Ivanov and extends work of Brendle-Margalit, who prove the result for surfaces without punctures." @default.
- W2892778911 created "2018-10-05" @default.
- W2892778911 creator A5024716838 @default.
- W2892778911 date "2018-10-01" @default.
- W2892778911 modified "2023-09-27" @default.
- W2892778911 title "Geometric normal subgroups in mapping class groups of punctured surfaces" @default.
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