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Proof of a conjecture of Wiegold for nilpotent Lie algebras
Sbornik: Mathematics ( IF 0.8 ) Pub Date : 2021-02-09 , DOI: 10.1070/sm9350
A. A. Skutin 1
Affiliation  

Let $\mathfrak{g}$ be a nilpotent Lie algebra. By the breadth $b(x)$ of an element $x$ of $\mathfrak{g}$ we mean the number $[\mathfrak{g}:C_{\mathfrak{g}}(x)]$. Vaughan-Lee showed that if the breadth of all elements of the Lie algebra $\mathfrak{g}$ is bounded by a number $n$, then the dimension of the commutator subalgebra of the Lie algebra does not exceed $n(n+1)/2$. We show that if $\dim \mathfrak{g'} > n(n+1)/2$ for some nonnegative $n$, then the Lie algebra $\mathfrak{g}$ is generated by the elements of breadth $>n$, and thus we prove a conjecture due to Wiegold (Question 4.69 in the Kourovka Notebook) in the case of nilpotent Lie algebras.

Bibliography: 4 titles.



中文翻译:

幂零李代数的 Wiegold 猜想的证明

让我们$\mathfrak{g}$成为一个幂零的李代数。通过广度$b(x)$元素$x$$\mathfrak{g}$我们指的是数量$[\mathfrak{g}:C_{\mathfrak{g}}(x)]$。Vaughan-Lee 证明,如果李代数的所有元素的宽度都$\mathfrak{g}$以一个数为界$n$,那么李代数的交换子子代数的维数不超过$n(n+1)/2$。我们证明,如果$\dim \mathfrak{g'} > n(n+1)/2$对于某些非负$n$,那么李代数$\mathfrak{g}$是由广度 的元素生成的$>n$,因此我们证明了在幂零李代数的情况下由于 Wiegold(Kourovka Notebook 中的问题 4.69)的一个猜想。

参考书目:4个标题。

更新日期:2021-02-09
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