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四重曲面奇点的一个注记

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四重曲面奇点的一个注记 洪杰, 陆俊华东师范大学数学科学学院及上海市核心数学与实践重点实验室 上海 200241 A Note on Surface Singularities of Multiplicity Four Jie HONG, Jun LUSchool of Mathematical Sciences, and Shanghai Key Laboratory of PMMP, East China Normal University, Shanghai 200241, P. R. China
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摘要P为复曲面Y之四重孤立奇点.众所周知,存在局部不可约有限覆盖π:(Y,P)→(X,p)满足π-1p)=P,以及Jung氏解消f?Y.今设Wp为(π ? f-1p)之例外除子,我们将证明Wp有唯一基本闭链分解Wp=2Z1Wpα=1l Zα使其满足若干性质.我们将定义πp处的指标wp,并用上述分解求其值.特别地,可证(Y,P)为奇点当且仅当wp ≥ 1.作为Wp分解式的另一应用,我们将计算?收缩到极小解消所需的步数.
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收稿日期: 2020-01-08
MR (2010):O187.1
基金资助:国家自然科学基金(11671140);上海市核心数学与实践重点实验室基金(18dz2271000)
通讯作者:陆俊,E-mail:jlu@math.ecnu.edu.cn
作者简介: 洪杰,E-mail:jhong@stu.ecnu.edu.cn
引用本文:
洪杰, 陆俊. 四重曲面奇点的一个注记[J]. 数学学报, 2021, 64(3): 455-462. Jie HONG, Jun LU. A Note on Surface Singularities of Multiplicity Four. Acta Mathematica Sinica, Chinese Series, 2021, 64(3): 455-462.
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http://www.actamath.com/Jwk_sxxb_cn/CN/ http://www.actamath.com/Jwk_sxxb_cn/CN/Y2021/V64/I3/455


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