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arXiv 1610.04425math.RA
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口头素T-理想与分次division algebras

Verbally prime T-ideals and graded division algebras

Eli Aljadeff, Yakov Karasik

摘要:

设$F$是特征为零的代数闭域,$G$是有限群.考虑自由$G$ -分次代数中的分次Verbally素$T$ -理想.原来,在普通情况下(即未分次)的等价定义扩展到分次情况下的非等价定义,即口头素$G$ -分次$T$ -理想和强口头素$T$ -理想。首先,我们按照Kemer的思想,对$G$ -分次的口头素$T$ -理想进行了分类.这篇论文的主要部分是讨论更强有力的概念。我们对仿射$G$ -分次代数的$T$ -理想或等价的包含Capelli多项式的$G$-分次$T$-理想的$G$ -分次强口头素$T$ -理想进行了分类.事实证明,这些正是$T$ -理想的$G$ -分次身份的有限维$G$ -分次,中央对$F$(即$Z(A)_{e}=F$),其中承认一个$G$ -分次除代数扭曲形式的领域$k$包含$F$或等价地在一个领域$k$包含足够的单位根(例如一个原始的$n$ -根单位,其中$n = ord(G)$)。

英文摘要:

Let $F$ be an algebraically closed field of characteristic zero and let $G$ be a finite group. We consider graded Verbally prime $T$-ideals in the free $G$-graded algebra. It turns out that equivalent definitions in the ordinary case (i.e. ungraded) extend to nonequivalent definitions in the graded case, namely verbally prime $G$-graded $T$-ideals and strongly verbally prime $T$-ideals. At first, following Kemer's ideas, we classify $G$-graded verbally prime $T$-ideals. The main bulk of the paper is devoted to the stronger notion. We classify $G$-graded strongly verbally prime $T$-ideals which are $T$-ideal of affine $G$-graded algebras or equivalently $G$-graded $T$-ideals that contain a Capelli polynomial. It turns out that these are precisely the $T$-ideal of $G$-graded identities of finite dimensional $G$-graded, central over $F$ (i.e. $Z(A)_{e}=F$) which admit a $G$-graded division algebra twisted form over a field $k$ which contains $F$ or equivalently over a field $k$ which contains enough roots of unity (e.g. a primitive $n$-root of unity where $n = ord(G)$).

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