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arXiv 2302.07069math.AG
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曲线的稳定映射与1-圈的代数等价

Stable maps of curves and algebraic equivalence of 1-cycles

János Kollár, Zhiyu Tian

摘要:

我们证明了代数等价的图像的稳定映射的曲线升降机变形等价的稳定映射。主要的应用关注$A_1(X)$,1-圈模代数等价的组,光滑,可分离的合理连接品种。如果$K/k$是代数扩张,则$A_1(X_k)\to A_1(X_K)$的核至多是${\mathbb Z}/2{\mathbb Z}$。如果$k$是有限的,那么图像等于伽罗瓦不变圈的子群。本文取代了2211.15915.v.1的第2- 3节和2211.15911.v.1的第2- 3节。其他章节保留在这些文件的修订本中。

英文摘要:

We show that algebraic equivalence of images of stable maps of curves lifts to deformation equivalence of the stable maps. The main applications concern $A_1(X)$, the group of 1-cycles modulo algebraic equivalence, for smooth, separably rationally connected varieties. If $K/k$ is an algebraic extension, then the kernel of $A_1(X_k)\to A_1(X_K)$ is at most ${\mathbb Z}/2{\mathbb Z}$. If $k$ is finite, then the image equals the subgroup of Galois invariant cycles. This paper replaces Sections~2--3 of 2211.15915.v.1 and Sections~2--3 of 2211.15911.v.1. The other Sections are retained in the revised versions of these papers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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