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arXiv 1502.05016math.RA
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k步幂零李代数

k-Step Nilpotent Lie Algebras

Michel Goze, Elisabeth Remm

摘要:

对于非半单的实有限维李代数的复形的分类仍处于早期阶段。例如,幂零李代数仅在7维以下被分类。而且,在分类表中识别给定的李代数并不容易。在这项工作中,我们提出了一个不同的方法来解决这个问题。我们确定家庭的一些固定的不变量,分类遵循一个变形过程或收缩过程。我们主要讨论了2步和3步幂零李代数的情形。我们描述在这两种情况下的变形上同调的这种类型的代数和代数是刚性的关于这个上同调。通过对刚性李代数的收缩得到了其它$p$ -步幂零李代数.

英文摘要:

The classification of complex of real finite dimensional Lie algebras which are not semi simple is still in its early stages. For example the nilpotent Lie algebras are classified only up to the dimension 7. Moreover, to recognize a given Lie algebra in a classification list is not so easy. In this work we propose a different approach to this problem. We determine families for some fixed invariants, the classification follows by a deformation process or contraction process. We focus on the case of 2 and 3-step nilpotent Lie algebras. We describe in both cases a deformation cohomology of this type of algebras and the algebras which are rigid regarding this cohomology. Other $p$-step nilpotent Lie algebras are obtained by contraction of the rigid ones.

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