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arXiv 2201.03034math.RA
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一类Koszul李代数的Kurosh定理

Kurosh theorem for certain Koszul Lie algebras

Simone Blumer

摘要:

Kurosh定理的群体提供了结构的任何子群的一个自由积的群体和它的证明依赖于巴斯塞尔理论的群体作用于树。在李代数的情况下,这样的一般理论并不存在,库罗什定理一般是错误的,因为它首先注意到希尔绍夫。然而,我们证明了,对于一类正分次李代数满足一定的局部性质的上同调,这样的结构定理成立的子代数在度1。这类由李代数组成,它的所有子代数都是在度$1$中生成的,并且是Koszul。

英文摘要:

The Kurosh theorem for groups provides the structure of any subgroup of a free product of groups and its proof relies on Bass-Serre theory of groups acting on trees. In the case of Lie algebras, such a general theory does not exists and the Kurosh theorem is false in general, as it was first noticed by Shirshov. However, we prove that, for a class of positively graded Lie algebras satisfying certain local properties in cohomology, such a structure theorem holds true for subalgebras generated in degree 1. Such class consists of Lie algebras, which have all the subalgebras generated in degree $1$ that are Koszul.

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