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- W4298002997 abstract "We study subsets in possibly degenerate symplectic vector spaces over finite fields, which are stable under a given Coxeter/Weyl reflection group. These symplectic root systems provide crucial combinatorical data to classify finite-dimensional Nichols algebras for nilpotent groups G over the complex numbers [Len13a], where the symplectic form is given by the group's commutator map. For example, the degree of degeneracy of the symplectic root system determines the size of the center of G. In this article we classify symplectic root systems over the finite field F_2, where symplectic just means isotropic. We prove that every Dynkin diagram admits, up to symplectic isomorphisms, a unique minimal symplectic root system over F_2 and thus requires a specific degree of degeneracy of the symplectic vector space. Any non-minimal symplectic root system turns out to be a quotient of a minimal one by a universal property. As examples and for further applications we explicitly construct all symplectic root systems for Cartan matrices resp. Dynkin diagrams of type ADE." @default.
- W4298002997 created "2022-10-01" @default.
- W4298002997 creator A5040825241 @default.
- W4298002997 date "2013-07-26" @default.
- W4298002997 modified "2023-10-16" @default.
- W4298002997 title "Root Systems In Finite Symplectic Vector Spaces" @default.
- W4298002997 doi "https://doi.org/10.48550/arxiv.1307.7151" @default.
- W4298002997 hasPublicationYear "2013" @default.
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