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arXiv 1712.08899math.RTmath.ACmath.AG
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与倾斜相关的拟凝聚层的Zebraki定域性

Zariski locality of quasi-coherent sheaves associated with tilting

Michal Hrbek, Jan Šťovíček, Jan Trlifaj

摘要:

雷诺和格鲁森的一个经典结果说,(无限维)向量丛的概念是Zebraki局部的。这个结果可以被看作是与(无限维)n-倾斜模和类相关的拟凝聚层的更一般概念的局部性的一个特殊例子(对于n = 0)。在这里,我们证明了后者的所有n和所有计划的地方。我们还证明了倾斜模的概念下降沿任意忠实平坦环态射在几个特定的情况下(包括情况下,当基环是诺特)。

英文摘要:

A classic result by Raynaud and Gruson says that the notion of an (infinite dimensional) vector bundle is Zariski local. This result may be viewed as a particular instance (for n = 0) of the locality of more general notions of quasi-coherent sheaves related to (infinite dimensional) n-tilting modules and classes. Here, we prove the latter locality for all n and all schemes. We also prove that the notion of a tilting module descends along arbitrary faithfully flat ring morphisms in several particular cases (including the case when the base ring is noetherian).

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