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arXiv 1001.4265math.AGmath.KT
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存在Z-生成几何螺旋时的阿贝尔变形和导出变形

Abelian and derived deformations in the presence of Z-generating geometric helices

Olivier De Deken, Wendy Lowen

摘要:

对于Grothendieck范畴C,通过Z-生成序列(O(n))n in Z}等价于伴随Z-代数A上的“拟凝聚模”范畴,我们证明了在适当的上同调条件下,“取拟凝聚模”定义了A的线性变形与C的交换变形之间的等价性.如果(O(n))n in Z}同时是导出范畴中的几何螺旋,我们证明了将(变形)Z-代数限制为对象的“线”定义了与相关矩阵代数的线性变形的进一步等价。

英文摘要:

For a Grothendieck category C which, via a Z-generating sequence (O(n))_{n in Z}, is equivalent to the category of "quasi-coherent modules" over an associated Z-algebra A, we show that under suitable cohomological conditions "taking quasi-coherent modules" defines an equivalence between linear deformations of A and abelian deformations of C. If (O(n))_{n in Z} is at the same time a geometric helix in the derived category, we show that restricting a (deformed) Z-algebra to a "thread" of objects defines a further equivalence with linear deformations of the associated matrix algebra.

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