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arXiv 1102.1100math.RTmath.RA
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基本代数的结构定理

Structure Theorems for Basic Algebras

Carl Fredrik Berg

摘要:

代数闭域$k$上的基本有限维代数同构于张量代数的容许理想商。代数上的左模范畴同构于具有关系的有限模的表示范畴。在本文中,我们将删除$k$是代数封闭的假设,以查看完全域和非完满域。我们将引入带关系的种的概念来描述这类代数上的左模范畴。如果域不是完美的,那么这个代数同构于一个张量代数与一个一般不再容许的理想的商。这使得遗传代数同构于一个张量代数与一个非零理想的商。我们将证明这些非零理想对应于与代数的种类相关联的图的循环子图。这将导致理想为零的情况下,代数的基础图是一棵树。

英文摘要:

A basic finite dimensional algebra over an algebraically closed field $k$ is isomorphic to a quotient of a tensor algebra by an admissible ideal. The category of left modules over the algebra is isomorphic to the category of representations of a finite quiver with relations. In this article we will remove the assumption that $k$ is algebraically closed to look at both perfect and non-perfect fields. We will introduce the notion of species with relations to describe the category of left modules over such algebras. If the field is not perfect, then the algebra is isomorphic to a quotient of a tensor algebra by an ideal that is no longer admissible in general. This gives hereditary algebras isomorphic to a quotient of a tensor algebra by a non-zero ideal. We will show that these non-zero ideals correspond to cyclic subgraphs of the graph associated to the species of the algebra. This will lead to the ideal being zero in the case when the underlying graph of the algebra is a tree.

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