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arXiv 2009.01097math.ACmath.AG
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交换DG-环上的光滑平坦映射

Smooth flat maps over commutative DG-rings

Liran Shaul

摘要:

我们研究光滑的地图,出现在派生代数几何。给定一个非正交换Noether DG-环之间的映射$A \to B$,它的维数是平坦的$0$,我们证明了它在Toën-Vezzosi意义下是光滑的当且仅当它在Kontsevich意义下是同调光滑的.然后我们证明了$B$作为$B\otimes^{\mathrm{L}}_A B$上的完美DG-模在局部有一个明确的半自由分解作为Koszul复形.作为一个应用程序,我们表明,一个强有力的形式之间的(派生)霍赫希尔德同调和上同调的Van den Bergh对偶持有在此设置。

英文摘要:

We study smooth maps that arise in derived algebraic geometry. Given a map $A \to B$ between non-positive commutative noetherian DG-rings which is of flat dimension $0$, we show that it is smooth in the sense of Toën-Vezzosi if and only if it is homologically smooth in the sense of Kontsevich. We then show that $B$, being a perfect DG-module over $B\otimes^{\mathrm{L}}_A B$ has, locally, an explicit semi-free resolution as a Koszul complex. As an application we show that a strong form of Van den Bergh duality between (derived) Hochschild homology and cohomology holds in this setting.

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