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arXiv 0901.2296math.RT
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希尔伯特空间范畴上箭图的正交表示。II

Orthoscalar representations of quivers on the category of Hilberts spaces. II

A. V. Roiter, S. A. Kryglyak, L. A. Nazarova

摘要:

众所周知,提出的抖动对应于Dynkin图(Gabriel,1972)和驯服抖动-扩展Dynkin图(Donovan和Freislich,Nazarova,1973)。在文章“Locally scalar representations of graphs in the category of Hilbers spaces”(Func. Anal.和Appl.,2005)的作者给出了将这些结果转移到希尔伯特空间的方法,构造了Coxeter函子,并证明了局部标量(后续为正交标量)表示(直到酉等价)的Gabriel定理的一个类似物。一个域的正交坐标表示的范畴可以被认为是所有表示范畴中的一个子范畴(在域$\mathbb C$上)。本文研究了不可分解的正音表示在子范畴与在一切表示范畴中的联系。对于对应于扩展Dynkin图的箭图,分类了不能由最简Coxeter函子得到的正交表示(正则表示).

英文摘要:

As it is known, finitely presented quivers correspond to Dynkin graphs (Gabriel, 1972) and tame quivers -- to extended Dynkin graphs (Donovan and Freislich, Nazarova, 1973). In the article "Locally scalar reresentations of graphs in the category of Hilbers spaces" (Func. Anal. and Appl., 2005) authors showed the way to tranfer these results to Hilbert spaces, constructed Coxeter functors and proved an analogue of Gabriel theorem fol locally scalar (orthoscalar in the sequel) representations (up to the unitary equivalence). The category of orthoscalar representations of a quiver can be considered as a subcategory in the category of all representations (over a field $\mathbb C$). In the present paper we study the connection between indecomposable orthoscalar representations in the subcategory and in the category of all representations. For the quivers, corresponded to extended Dynkin graphs, orthoscalar representations which cannot be obtained from the simplest by Coxeter functors (regular representations) are classified.

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