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arXiv 1701.05992math.RAmath.AC
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关于局部有限或局部幂零导子和${\mathcal E}$ -导子的若干公开问题

Some Open Problems on Locally Finite or Locally Nilpotent Derivations and ${\mathcal E}$-Derivations

Wenhua Zhao

摘要:

设$R$是交换环,$\mathcal A$是$R$ -代数. $\mathcal A$的$R$ - $\mathcal E$ -导子是$\mathcal A$的某个$R$ -代数自同态$ϕ$的形式为$\operatorname{I}-ϕ$的$R$ -线性映射,其中$\operatorname{I}$表示$\mathcal A$的恒等映射.本文讨论了$\mathcal A$的局部有限$R$ -导子或$\mathcal E$ -导子的象是否是$\mathcal A$的Mathieu子空间[Z ~ 2,Z ~ 3],以及$\mathcal A$的局部幂零$R$ -导子或$\mathcal E$ -导子是否将$\mathcal A$的每个理想映射到$\mathcal A$的Mathieu子空间的问题.我们提出并讨论了两个定理,证明了当基环$R$是特征为零的域时,上述两个问题都有正解。本文举例说明了这两个条件的必要性,并讨论了文献中已知的一些正例。我们还展示了这两种情况的一些案例。特别地,对于特征为零的整环的局部有限或局部幂零代数导子和$\mathcal E$ -导子,证明了这两个定理.

英文摘要:

Let $R$ be a commutative ring and $\mathcal A$ an $R$-algebra. An $R$-$\mathcal E$-derivation of $\mathcal A$ is an $R$-linear map of the form $\operatorname{I}-ϕ$ for some $R$-algebra endomorphism $ϕ$ of $\mathcal A$, where $\operatorname{I}$ denotes the identity map of $\mathcal A$. In this paper we discuss some open problems on whether or not the image of a locally finite $R$-derivation or $R$-$\mathcal E$-derivation of $\mathcal A$ is a Mathieu subspace [Z2, Z3] of $\mathcal A$, and whether or not a locally nilpotent $R$-derivation or $R$-$\mathcal E$-derivation of $\mathcal A$ maps every ideal of $\mathcal A$ to a Mathieu subspace of $\mathcal A$. We propose and discuss two conjectures which state that both questions above have positive answers if the base ring $R$ is a field of characteristic zero. We give some examples to show the necessity of the conditions of the two conjectures, and discuss some positive cases known in the literature. We also show some cases of the two conjectures. In particular, both the conjectures are proved for locally finite or locally nilpotent algebraic derivations and $\mathcal E$-derivations of integral domains of characteristic zero.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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