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arXiv 1901.07532math.RT
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限制Filiform李代数$\mathfrak{m}_2^λ(p)$的上同调

Cohomology of Restricted Filiform Lie Algebras $\mathfrak{m}_2^λ(p)$

Tyler J. Evans, Alice Fialowski

摘要:

对于素特征为$p\ge 5$的域${\mathbb F}$上的$p$维丝状李代数${\mathfrak m}_2(p)$,对于$1<i<p$具有非零李括号$[e_1,e_i] = e_{i+1}$,对于$2<i<p-1$具有非零李括号$[e_2,e_i]=e_{i+2}$,我们证明了存在一族由元素$λ\in {\mathbb F}^p$参数化的限制李代数结构${\mathfrak m}_2^λ(p)$.我们明确地描述了普通和限制1-和2-上同调空间的平凡系数的基础,并给出相应的限制一维中心扩张的括号和$[p]$ -操作的公式。

英文摘要:

For the $p$-dimensional filiform Lie algebra ${\mathfrak m}_2(p)$ over a field ${\mathbb F}$ of prime characteristic $p\ge 5$ with nonzero Lie brackets $[e_1,e_i] = e_{i+1}$ for $1<i<p$ and $[e_2,e_i]=e_{i+2}$ for $2<i<p-1$, we show that there is a family ${\mathfrak m}_2^λ(p)$ of restricted Lie algebra structures parameterized by elements $λ\in {\mathbb F}^p$. We explicitly describe bases for the ordinary and restricted 1- and 2-cohomology spaces with trivial coefficients, and give formulas for the bracket and $[p]$-operations in the corresponding restricted one-dimensional central extensions.

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