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arXiv math/0512656math.RTmath.RA
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具有单模最小分解的高维代数

Finite-dimensional algebras with smallest resolutions of simple modules

Shashidhar Jagadeeshan, Mark Kleiner

摘要:

设$X$是左Artinian环$R$上的一个非负生成左模,$p(X)=\{l_i\}$是非负整数的无限序列,其中$l_i$是$X$的最小投射分解的第$i$项的长度.我们在集合$\{p(X)\}$上引入一个预序关系$\le$,并刻画了初等有限维代数$Λ$具有以下性质.设$S$是一个简单的$Λ$ -模,$T$是任意左Artin环$R$上的一个单生成模.如果$S$的投影维数不超过$T$的投影维数,则为$p(S)\le p(T)$。我们用具有关系的箭图刻画了指示代数。

英文摘要:

Let $X$ be a finitely generated left module over a left artinian ring $R$, and let $p(X)=\{l_i\}$ be the infinite sequence of nonnegative integers where $l_i$ is the length of the $i$-th term of the minimal projective resolution of $X$. We introduce a preorder relation $\le$ on the set $\{p(X)\}$ and characterize the elementary finite-dimensional algebras $Λ$ with the following property. Let $S$ be a simple $Λ$-module, and let $T$ be a finitely generated module over an arbitrary left artinian ring $R$. If the projective dimension of $S$ does not exceed the projective dimension of $T$, then $p(S)\le p(T)$. We characterize the indicated algebras by quivers with relations.

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