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arXiv 0905.2599math-phmath.MP
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李代数的扭上圈与相应的不变函数

Twisted cocycles of Lie algebras and corresponding invariant functions

Jiri Hrivnak, Petr Novotny

摘要:

我们考虑有限维复李代数。利用复参数推广了李代数上同调上圈的概念。一个特殊的情况是1-上循环关于伴随表示的推广-所谓的$(α,β,γ)$ -导子。上循环空间的参数集允许我们定义在李同构下不变的复函数。这样的复杂功能,因此代表有用的不变量-我们展示了他们如何分类三维和四维李代数,以及他们如何适用于一些八维单参数幂零连续的李代数。这些函数也提供了1-参数连续收缩存在的必要判据。

英文摘要:

We consider finite-dimensional complex Lie algebras. Using certain complex parameters we generalize the concept of cohomology cocycles of Lie algebras. A special case is generalization of 1-cocycles with respect to the adjoint representation - so called $(α,β,γ)$--derivations. Parametric sets of spaces of cocycles allow us to define complex functions which are invariant under Lie isomorphisms. Such complex functions thus represent useful invariants - we show how they classify three and four-dimensional Lie algebras as well as how they apply to some eight-dimensional one-parametric nilpotent continua of Lie algebras. These functions also provide necessary criteria for existence of 1-parametric continuous contraction.

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