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arXiv 0812.1383math.GRmath.MG
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在两个以上的Kac-Moody群中的格是算术的

A lattice in more than two Kac--Moody groups is arithmetic

Pierre-Emmanuel Caprace, Nicolas Monod

摘要:

设$Γ$是有限域上n个无限不可约完全单缀型Kac-Moody群的乘积中的不可约格.证明了当n ≥ 3时,每个Kac-Moody群实际上是局部域上的单代数群,$Γ$是算术格.这依赖于以下的替代方案,满足任何不可约格提供n至少是2:要么$Γ$是一个S-算术(因此线性)群,或者它不是剩余有限的。在这种情况下,当基域足够大时,它甚至实际上是简单的。更一般的CAT(0)组也被认为是整个。

英文摘要:

Let $Γ$ be an irreducible lattice in a product of n infinite irreducible complete Kac-Moody groups of simply laced type over finite fields. We show that if n is at least 3, then each Kac-Moody groups is in fact a simple algebraic group over a local field and $Γ$ is an arithmetic lattice. This relies on the following alternative which is satisfied by any irreducible lattice provided n is at least 2: either $Γ$ is an S-arithmetic (hence linear) group, or it is not residually finite. In that case, it is even virtually simple when the ground field is large enough. More general CAT(0) groups are also considered throughout.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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