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arXiv 1109.2986math.RA
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路余代数的自同构及其应用

Automorphisms of path coalgebras and applications

Yu Ye

摘要:

主要目的是引入箭图的trans-datum概念,并将其应用于路余代数和代数的自同构群的研究。我们观察到路余代数的任何同态都是由trans-datum唯一确定的,这是我们工作的基础。在这种对应关系下,我们证明了任何一个$Q$从$\aut(kQ^c)$到$Ω^*(Q)$的同构,从$Q$到它本身的可逆trans-data组。我们指出,当所有因子群都确定时,Corradical滤除给出了$\aut(kQ^c)$的一个正规子群塔.推广这一事实,我们建立了一个非循环箭图的类Galois理论,它给出了路余代数的大子余代数与它们的伽罗瓦群之间的双射,将路余代数的大子余代数与它的自同构群的某些子群联系起来。通过对群$\aut(kQ^c)$的某些子群的研究,讨论了它的性质,并给出了相应的trans-data.利用自反余代数与代数之间的对偶性,得到了$\aut(\hat{kQ^a})$对于有限的$Q$的结构结果,其中$\hat{kQ^a}$是完备路代数.此外,我们还将这些结果应用于有限维初等代数,恢复了一些经典结果。

英文摘要:

Our main purpose is to introduce the notion of trans-datum for quivers, and apply it to the study of automorphism groups of path coalgebras and algebras. We observe that any homomorphism of path coalgebras is uniquely determined by a trans-datum, which is the basis of our work. Under this correspondence, we show for any quiver $Q$ an isomorphism from $\aut(kQ^c)$ to $Ω^*(Q)$, the group of invertible trans-data from $Q$ to itself. We point out that the coradical filtration gives to a tower of normal subgroups of $\aut(kQ^c)$ with all factor groups determined. Generalizing this fact, we establish a Galois-like theory for acyclic quivers, which gives a bijection between large subcoalgebras of the path coalgebra and their Galois groups, relating large subcoalgebras of a path coalgebra with certain subgroups of its automorphism group. The group $\aut(kQ^c)$ is discussed by studying its certain subgroups, and the corresponding trans-data are given explicitly. By the duality between reflexive coalgebras and algebras, we therefore obtain some structural results of $\aut(\hat{kQ^a})$ for a finite quiver $Q$, where $\hat{kQ^a}$ is the complete path algebra. Moreover, we also apply these results to finite dimensional elementary algebras and recover some classical results.

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