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arXiv 1109.0901math.GR
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代数群在Kac-Moody群中的嵌入

Embeddings of algebraic groups in Kac-Moody groups

Guntram Hainke

摘要:

设$k_1,k_2$是特征为0的两个字段。设$G_1$是$k_1$上的分裂半单代数群,$G_2$是$k_2$上的分裂Kac-Moody群,$ϕ\colon G_1(k_1)\to G_2(k_2)$是抽象嵌入.证明了当$k_1$是有理数的代数扩张时,$\im ϕ$是有界子群,而当$k_1$在有理数上具有无穷超越度时,存在无界象嵌入.

英文摘要:

Let $k_1,k_2$ be two fields of characteristic 0. Let $G_1$ be a split semisimple algebraic group over $k_1$, $G_2$ a split Kac--Moody group over $k_2$ and $ϕ\colon G_1(k_1)\to G_2(k_2)$ an abstract embedding. We show that $\im ϕ$ is a bounded subgroup whenever $k_1$ is an algebraic extension of the rational numbers, while there are embeddings with unbounded image if $k_1$ has infinite transcendence degree over the rational numbers.

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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