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arXiv 1607.02609math.CT
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抽象模范畴中的可对偶对象和半平坦对象

Dualizable and semi-flat objects in abstract module categories

Rune Harder Bak

摘要:

本文定义了抽象模范畴中的对象是可对偶的,并给出了可对偶对象的直接极限闭包的同调描述。我们的描述恢复了Govorov和Lazard,Oberst和R{<$}hrl,Christensen和Holm的现有结果。当应用于微分分次代数上的微分分次模时,我们的描述得到了一个DG-模是半平坦的当且仅当它可以作为半自由DG-模的直接极限得到.对于分次环上的分次模和nice格式上的拟凝聚层,我们得到了类似的结果。

英文摘要:

In this paper, we define what it means for an object in an abstract module category to be dualizable and we give a homological description of the direct limit closure of the dualizable objects. Our description recovers existing results of Govorov and Lazard, Oberst and R{ö}hrl, and Christensen and Holm. When applied to differential graded modules over a differential graded algebra, our description yields that a DG-module is semi-flat if and only if it can be obtained as a direct limit of finitely generated semi-free DG-modules. We obtain similar results for graded modules over graded rings and for quasi-coherent sheaves over nice schemes.

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