arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1603.09261math.AGmath.NT
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非稳定有理簇,零圈和非分歧上同调

Varieties that are not stably rational, zero-cycles and unramified cohomology

Alena Pirutka

摘要:

这是一个最近的例子,品种是不稳定的理性的调查。我们审查的专业化方法的基础上的性质的周群的零圈在这些例子中使用,并解释的角度来看,非分歧上同调的特殊纤维的非平凡稳定不变量的建设。特别是,我们找到了一个明确的公式布劳尔群的四重纤维在二次维数二次有理曲面。

英文摘要:

This is a survey of recent examples of varieties that are not stably rational. We review the specialization method based on properties of the Chow group of zero-cycles used in these examples and explain the point of view of unramified cohomology for the construction of nontrivial stable invariants of the special fiber. In particular, we find an explicit formula for the Brauer group of fourfolds fibered in quadrics of dimension two over a rational surface.

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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