%0 Journal Article
%T A characterization of groups of parahoric type
%A Fran£żois Court¨¨s
%J Mathematics
%D 2012
%I arXiv
%X 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.
%U http://arxiv.org/abs/1202.3396v4