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arXiv 0907.2034math.RA
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关于李代数和超代数的$δ$ -导子

On $δ$-derivations of Lie algebras and superalgebras

Pasha Zusmanovich

摘要:

我们研究了$δ$ -导子--同时推广导子和质心的构造。首先,我们计算了当前李代数和模Zassenhaus代数的$δ$ -导子。这使我们能够提供的例子李代数有1/2导子是零的因子,从而回答否定的问题Filippov。其次,我们注意到,$δ$导子允许,在某些情况下,构造的例子,非半群分次的李代数,除了最近发现的Elduque。第三,我们注意到利用Grassmann包络的构造可以从李代数的相应结果得到李超代数的$δ$ -(超)导子的结果.这样,我们证明了素李超代数不具有非平凡的$δ$ -(超)导子,推广了Kaygorodov最近的结果.

英文摘要:

We study $δ$-derivations -- a construction simultaneously generalizing derivations and centroid. First, we compute $δ$-derivations of current Lie algebras and of modular Zassenhaus algebra. This enables us to provide examples of Lie algebras having 1/2-derivations which are divisors of zero, thus answering negatively a question of Filippov. Second, we note that $δ$-derivations allow, in some circumstances, to construct examples of non-semigroup gradings of Lie algebras, in addition to the recent ones discovered by Elduque. Third, we note that utilizing the construction of the Grassmann envelope allows to obtain results about $δ$-(super)derivations of Lie superalgebras from the corresponding results about Lie algebras. In this way, we prove that prime Lie superalgebras do not possess nontrivial $δ$-(super)derivations, generalizing the recent result of Kaygorodov.

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