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arXiv 1206.6019math.AGmath.CT
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关于Calabi-Yau d-褶皱交换反射函子的注记

A Note on Commuting Reflection Functors for Calabi-Yau d-folds

Antony Maciocia

摘要:

研究了Calabi-Yau簇上层的导出范畴中的交换反射函子集。我们表明,这样的集合是由一组相互正交的球形对象。我们还表明,当球形物体是局部自由层,然后内核的复合变换parametrizes正确扭转免费与零维奇异集,相反,这样的内核产生一个相互正交的球形向量丛的集合。我们通过更详细地分析为什么球面扭曲给出等价性来做到这一点。

英文摘要:

We study sets of commuting reflection functors in the derived category of sheaves on Calabi-Yau varieties. We show that such a collection is determined by a set of mutually orthogonal spherical objects. We also show that when the spherical objects are locally-free sheaves then the kernel of the composite transform parametrizes properly torsion-free with zero-dimensional singularity sets and conversely that such a kernel gives rise to a collection of mutually orthogonal spherical vector bundles. We do this using a more detailed analysis of the reason why spherical twists give equivalences.

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