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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1902.03641math.RA
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有限图的Leavitt路代数的角是Leavitt路代数

Corners of Leavitt path algebras of finite graphs are Leavitt path algebras

Gene Abrams, T. G. Nam

摘要:

我们实现了一个非常有用的描述(同构)的莱维特路代数$L_K(E)$的有限图$E$的系数在一个字段$K$作为矩阵环的直和$K$,直和与一个图$F$的莱维特路代数$L_K(F)$的一个角,其中每个正规顶点是一个循环的基础。此外,在这种情况下,可以通过使用“源消除”和“折叠”过程的一些逐步过程将图$E$变换为图$F$。我们利用这一点来建立文章的主要结果,即有限图的Leavitt路代数的每个非零角同构于Leavitt路代数。事实上,我们证明了一个更一般的结果,即,任何非零的生成的投射$L_K(E)$ -模的自同态环同构于从$E$显式构造的图的Leavitt路代数。因此,特别地,这产生每个与莱维特路代数Morita等价的单位$K$ -代数确实同构于莱维特路代数。

英文摘要:

We achieve an extremely useful description (up to isomorphism) of the Leavitt path algebra $L_K(E)$ of a finite graph $E$ with coefficients in a field $K$ as a direct sum of matrix rings over $K$, direct sum with a corner of the Leavitt path algebra $L_K(F)$ of a graph $F$ for which every regular vertex is the base of a loop. Moreover, in this case one may transform the graph $E$ into the graph $F$ via some step-by-step procedure, using the "source elimination" and "collapsing" processes. We use this to establish the main result of the article, that every nonzero corner of a Leavitt path algebra of a finite graph is isomorphic to a Leavitt path algebra. Indeed, we prove a more general result, to wit, that the endomorphism ring of any nonzero finitely generated projective $L_K(E)$-module is isomorphic to the Leavitt path algebra of a graph explicitly constructed from $E$. Consequently, this yields in particular that every unital $K$-algebra which is Morita equivalent to a Leavitt path algebra is indeed isomorphic to a Leavitt path algebra.

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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