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arXiv 1706.00860math.RTmath.AG
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通过欧拉示性数和Grassmannian的奇点的表示类型

Representation type via Euler characteristics and singularities of quiver Grassmannians

Oliver Lorscheid, Thorsten Weist

摘要:

本文利用非循环图的Grassmannian的性质刻画了非循环图的表示类型。这个特征利用并扩展了已知的结果奇异的Grassmannian和胞腔剖分到仿射空间。虽然有限表示类型$A$和$D$的箭图的不可分解表示的所有非光滑格拉斯曼算子都是光滑的,并且允许胞腔分解,但事实证明,$A$和$D$的箭图的不可分解表示的所有非光滑格拉斯曼算子都允许胞腔剖分,但这些非光滑格拉斯曼算子中的一些是奇异的(甚至是变种)。一个群是野的当且仅当存在一个具有负欧拉示性数的群格拉斯曼。

英文摘要:

In this text, we characterize the representation type of an acyclic quiver by the properties of its associated quiver Grassmannians. This characterization utilizes and extends known results about singular quiver Grassmannians and cell decompositions into affine spaces. While all quiver Grassmannians for indecomposable representations of quivers of finite representation types $A$ and $D$ are smooth and admit cell decompositions, it turns out that all quiver Grassmannians for indecomposable representations of quivers of tame types $A$ and $D$ admit cell decompositions, but some of these quiver Grassmannians are singular (even as varieties). A quiver is wild if and only if there exists a quiver Grassmannian with negative Euler characteristic.

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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