A characterization of groups of parahoric type

Details A characterization of groups of parahoric type A characterization of groups of parahoric type

2012-02-15

arxiv.org/abs/1202.3396v2

Mathematics

Group Theory

Scientific paper

Let F be a local henselian nonarchimedean field of residual field k, and let G be the group of F-points of a connected reductive group defined over F. It is well-known that the quotient of any parahoric subgroup of G by its first congruence subgroup is isomorphic to the group of k-points of a reductive group defined over k, and conversely; in this paper, we generalize this result by studying a class of linear algebraic groups named groups of parahoric type; we prove that, under certain conditions, any such group is k-isomorphic to the quotient of a parahoric subgroup of some reductive group over F by its h-th congruence subgroup for a suitable h.

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