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- W3089289220 abstract "In a recent article, Cumplido and Paris studied the question of commensurability between Artin groups of spherical type. Their analysis left six cases undecided, for the following pairs of Artin groups: $(F_4,D_4)$, $(H_4,D_4)$, $(F_4,H_4)$, $(E_6,D_6)$, $(E_7,D_7)$, and $(E_8,D_8)$. In this note we resolve the first two of these cases, namely, we show that the Artin groups of types $F_4$ and $H_4$ are not commensurable with that of type $D_4$. As a key step, we realize the abstract commensurator of the Artin group of type $D_4$ as the extended mapping class group of the torus with three punctures. We also find the automorphism group of the Artin group of type $D_4$ and obtain a description of torsion elements, their orders and conjugacy classes in all irreducible Artin groups of spherical type modulo their centers." @default.
- W3089289220 created "2020-10-01" @default.
- W3089289220 creator A5064583041 @default.
- W3089289220 date "2020-09-22" @default.
- W3089289220 modified "2023-09-27" @default.
- W3089289220 title "Artin groups of types $F_4$ and $H_4$ are not commensurable with $D_4$" @default.
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