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arXiv 1601.04313math.RA
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关于分式域导子的幂零李代数

On nilpotent Lie algebras of derivations of fraction fields

A. P. Petravchuk

摘要:

设$K$是特征为零的任意域,$A$是交换结合的$ K$ -代数,它是整环.用$R$表示$A$的分数域,用$W(A)=RDer_{\mathbb K}A,$表示$\mathbb K$的李代数-$R$的导子由$Der_{\mathbb K}A$通过乘以$R.$的元素得到如果$L\subseteq W(A)$是$W(A)$的子代数,则用$rk_{R}L$表示域$R$上的向量空间$RL$的维数,用$F=R^{L}$表示$L$在$R.$中的常数域令$L$是具有$rk_{R}L\leq 3$的幂零子代数$L\subseteq W(A)$。证明了李代数$FL$(作为域$F$上的李代数)同构于李代数$Der F[x_{1}, x_{2}, x_{3}], $的三角李子代数$u_{3}(F)$的一个有限维子代数,其中$u_{3}(F)=\{f(x_{2}, x_{3})\frac{\partial}{\partial x_{1}}+g(x_{3})\frac{\partial}{\partial x_{2}}+c\frac{\partial}{\partial x_{3}}\}$ with $f\in F[x_{2}, x_{3}], g\in F[x_3]$,$c\in F.$特别地,得到了三元多项式系数向量场的幂零李代数的一个特征.

英文摘要:

Let $K$ be an arbitrary field of characteristic zero and $A$ a commutative associative $ K$-algebra which is an integral domain. Denote by $R$ the fraction field of $A$ and by $W(A)=RDer_{\mathbb K}A,$ the Lie algebra of $\mathbb K$-derivations of $R$ obtained from $Der_{\mathbb K}A$ via multiplication by elements of $R.$ If $L\subseteq W(A)$ is a subalgebra of $W(A)$ denote by $rk_{R}L$ the dimension of the vector space $RL$ over the field $R$ and by $F=R^{L}$ the field of constants of $L$ in $R.$ Let $L$ be a nilpotent subalgebra $L\subseteq W(A)$ with $rk_{R}L\leq 3$. It is proven that the Lie algebra $FL$ (as a Lie algebra over the field $F$) is isomorphic to a finite dimensional subalgebra of the triangular Lie subalgebra $u_{3}(F)$ of the Lie algebra $Der F[x_{1}, x_{2}, x_{3}], $ where $u_{3}(F)=\{f(x_{2}, x_{3})\frac{\partial}{\partial x_{1}}+g(x_{3})\frac{\partial}{\partial x_{2}}+c\frac{\partial}{\partial x_{3}}\}$ with $f\in F[x_{2}, x_{3}], g\in F[x_3]$, $c\in F.$ In particular, a characterization of nilpotent Lie algebras of vector fields with polynomial coefficients in three variables is obtained.

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