Moving lemma and Bertini type theorems

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:刘青(法国波尔多大学)
:2023-06-12 09:00
:海韵园实验楼110报告厅

报告人:刘青法国波尔多大学

 间:20236129:00

 点:海韵园实验楼110报告厅

内容摘要:

Let X be a projective scheme over an affine scheme S. In a joint work with Gabber and Lorenzini we prove that for any closed subset F of X quasi-finite over S, there exist  hypersurfaces of X avoiding F. As an application we will prove that any projective module over a (commutative) ring A becomes a direct sum of rank 1 projective modules after a finite faithfully flat extension of A.

人简介

刘青,法国波尔多大学教授,2013-2022年期间曾兼任厦门大学讲座教授。1987年博士毕业于法国波尔多大学,研究领域为代数几何与算术几何,著有一本颇有影响的教材《Algebraic Geometry and Arithmetic Curves,Inventiones mathematicae, Duke Mathematical Journal, Compositio Mathematica, Journal of Algebraic Geometry, Mathematische Annalen等重要期刊上发表多篇文章。曾是Journal de Théorie des Nombres de Bordeaux的编委。

 

联系人:刘文飞