Smooth flat maps over commutative DG-rings
Smooth flat maps over commutative DG-rings
复制标题
可交换 DG 环上的平滑平面映射
DOI:
--
复制
发表时间:
2020
影响因子:
0.8
通讯作者:
Liran Shaul
中科院分区:
文献类型:
--
作者:
Liran Shaul
We study smooth maps that arise in derived algebraic geometry. Given a map A→Bdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$A
ightarrow B$$end{document} 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⊗ALBdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$Botimes ^{{mathrm {L}}}_A B$$end{document} 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.