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arXiv 0708.3418math.AGmath.COmath.RT
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Dynkin型颤动系数

Quiver coefficients of Dynkin type

Anders Skovsted Buch

摘要:

研究了环的Grothendieck类,即环的表示空间的不变闭子簇。对于没有定向圈的箭图,我们证明了一个类的一个循环是由一个系数,推广了早期研究的系数的等定向的A型箭图。我们猜想,该系数满足正性和有限性。我们的主要结果是一个公式的Dynkin型轨道闭包的有理奇点,这证实了有限性猜想。这个公式是基于Reineke对这种轨道闭合的去奇异化。对于A3型箭图,我们给出了关于箭图系数的正组合公式,从而证实了全部猜想。我们还解释了由向量丛映射的箭图所定义的退化轨迹的公式,即简并系数。

英文摘要:

We study the Grothendieck classes of quiver cycles, i.e. invariant closed subvarieties of the representation space of a quiver. For quivers without oriented loops we show that the class of a quiver cycle is determined by quiver coefficients, which generalize the earlier studied quiver coefficients for equioriented quivers of type A. We conjecture that quiver coefficients satisfy positivity and finiteness properties. Our main result is a formula for the quiver coefficients for orbit closures of Dynkin type with rational singularities, which confirms the finiteness conjecture. This formula is based on Reineke's desingularization of such orbit closures. For quivers of type A3, we give positive combinatorial formulas for the quiver coefficients, which confirm the full conjecture. We also interpret quiver coefficients as formulas for degeneracy loci defined by quivers of vector bundle maps.

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