Maximality of hyperspecial compact subgroups avoiding Bruhat-Tits theory

Maximality of hyperspecial compact subgroups avoiding Bruhat-Tits theory
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避免 Bruhat-Tits 理论的超特殊紧子群的极大性

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发表时间:
2015
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通讯作者:
Marco Maculan
Marco Maculan
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作者:
Marco Maculan

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设$k$是一个完备的非阿基米德域(非平凡值)。给定一个约化的k-群G,证明了G(k)的超特殊子群(即由G的约化模型产生的超特殊子群)在有界子群中是极大的.独创性在于论点:它是由$的情况下, extrm{GL}_n$并避免了对G$的Bruhat-Tits建筑的所有考虑。
Let $k$ be a complete non-archimedean field (non trivially valued). Given a reductive $k$-group $G$, we prove that hyperspecial subgroups of $G(k)$ (i.e. those arising from reductive models of $G$) are maximal among bounded subgroups. The originality resides in the argument: it is inspired by the case of $ extrm{GL}_n$ and avoids all considerations on the Bruhat-Tits building of $G$.