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arXiv 1802.01776math.NT
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有限域上曲面的Brauer群

The Brauer Group of a Surface over a Finite Field

Yuri G. Zarhin

摘要:

这是作者1989年的俄文笔记的英译本,发表在《品种的算术和几何》(V.E. Voskresenski,ed.),古比雪夫国立大学,古比雪夫,1989年,pp. 57--67.设$X$是奇特征有限域$k$上的绝对不可约光滑射影曲面,$Br(X)$是$X$的(交换周期)Brauer群,$DIV Br(X)$是它的可除元素的子群.我们将商$Br(X)/DIV Br(X)$写成$Br(X)_{DIV}$,将其(有限)$2$ -主分量写成$Br(X)_{DIV}(2)$。我们证明了$Br(X)_{DIV}(2)$的顺序是一个完整的平方以下额外的假设$\bar{X}=X\times \bar{k}$其中$ \bar{k}$是$k$的代数闭包。在$\bar{X}$的Néron-Severi群中不存在2-挠。表面$\bar{X}$允许提升到特征0。证明是基于作者的论文(数学。苏联Izv。20(1983),203-234)和吴的定理,涉及Stiefel-Whitney类和Steenrod平方。

英文摘要:

This is an English translation of the author's 1989 note in Russian, published in a collection "Arithmetic and Geometry of Varieties" (V.E. Voskresenski, ed.), Kuibyshev State University, Kuibyshev, 1989, pp. 57--67. Let $X$ be be an absolutely irreducible smooth projective surface over a finite field $k$ of odd characteristic, let $Br(X)$ be the (commutative periodic) Brauer group of $X$ and $DIV Br(X)$ the subgroup of its divisible elements. We write $Br(X)_{DIV}$ for the quotient $Br(X)/DIV Br(X)$ and $Br(X)_{DIV}(2)$ for its (finite) $2$-primary component. We prove that the order of $Br(X)_{DIV}(2)$ is a full square under the following additional assumptions on $\bar{X}=X\times \bar{k}$ where $ \bar{k}$ is an algebraic closure of $k$. There is no 2-torsion in the Néron-Severi group of $\bar{X}$. The surface $\bar{X}$ admits a lifting to characteristic 0. The proof is based on constructions of author's paper (Math. USSR Izv. 20 (1983), 203-234) and Wu's Theorem that relates Stiefel-Whitney classes and Steenrod squares.

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