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arXiv 1912.03027math.RAmath.AT
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具有对合的矩阵代数的生成元空间

Spaces of generators for matrix algebras with involution

Taeuk Nam, Cindy Tan, Ben Williams

摘要:

设$k$是特征不同于2的代数闭域。在同构之前,如果$n$是奇数,则代数$\operatorname{Mat}_{n \times n}(k)$可以以一种方式被赋予$k$ -线性对合,如果$n$是偶数,则可以以两种方式被赋予。本文考虑$r$ -元组$A_\bullet \in \operatorname{Mat}_{n\times n}(k)^r$使得$A_\bullet$的元素不能生成$\operatorname{Mat}_{n\times n}(k)$作为一个具有对合的代数.我们表明,这样的$r$ -元组的轨迹形成一个封闭的子品种$Z(r;V)$的$\operatorname{Mat}_{n\times n}(k)^r$,是不是不可约。我们描述的不可约组件,我们计算的尺寸最大的组件$Z(r;V)$在所有情况下。这给出了一个数值答案的问题是如何通用的$r$元组$(a_1, \dots, a_r)$的元素在$\operatorname{Mat}_{n\times n}(k)$生成它作为一个代数与对合。

英文摘要:

Let $k$ be an algebraically closed field of characteristic different from 2. Up to isomorphism, the algebra $\operatorname{Mat}_{n \times n}(k)$ can be endowed with a $k$-linear involution in one way if $n$ is odd and in two ways if $n$ is even. In this paper, we consider $r$-tuples $A_\bullet \in \operatorname{Mat}_{n\times n}(k)^r$ such that the entries of $A_\bullet$ fail to generate $\operatorname{Mat}_{n\times n}(k)$ as an algebra with involution. We show that the locus of such $r$-tuples forms a closed subvariety $Z(r;V)$ of $\operatorname{Mat}_{n\times n}(k)^r$ that is not irreducible. We describe the irreducible components and we calculate the dimension of the largest component of $Z(r;V)$ in all cases. This gives a numerical answer to the question of how generic it is for an $r$-tuple $(a_1, \dots, a_r)$ of elements in $\operatorname{Mat}_{n\times n}(k)$ to generate it as an algebra with involution.

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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