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arXiv math/0605690math.ACmath.RT
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任意特征向量不变量

Vector invariants in arbitrary characteristic

Frank D. Grosshans

摘要:

设k是特征p > 0的代数闭域。设H是GL(n,k)的子群.我们感兴趣的是确定H的向量不变量。当k的特征为0时,已知d个向量的不变量d > n是通过极化从n个向量的不变量获得的。即使在H是环面的情况下,当char k = p > 0时,该结果也不成立。然而,我们表明,代数的不变量总是积分代数的极化不变量,当H是约化的,实际上是p -根封闭的代数。我们也给出了条件的代数是平等的,有关平等良好的过滤和饱和子群。最后给出了H是有限群、典型群或GL(n,k)的幂幺子群的例子.

英文摘要:

Let k be an algebraically closed field of characteristic p > 0. Let H be a subgroup of GL(n,k). We are interested in the determination of the vector invariants of H. When the characteristic of k is 0, it is known that the invariants of d vectors, d > n, are obtained from those of n vectors by polarization. This result is not true when char k = p > 0 even in the case where H is a torus. However, we show that the algebra of invariants is always integral over the algebra of polarized invariants and when H is reductive is actually the p - root closure of that algebra. We also give conditions for the algebras to be equal, relating equality to good filtrations and saturated subgroups. We conclude with examples where H is finite or a classical group or is a certain kind of unipotent subgroup of GL(n,k).

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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