Bemerkungen zur Deformationstheorie nichtrationaler Singularitäten

Bemerkungen zur Deformationstheorie nichtrationaler Singularitäten
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变形理论的奇异性分析

DOI:
10.1007/bf01637625
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发表时间:
1974
影响因子:
0.6
通讯作者:
O. Riemenschneider
O. Riemenschneider
中科院分区:
数学4区
文献类型:
--
作者:
O. Riemenschneider

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设是复空间之间的1-凸全纯映射。S,且设为S上的向下因子分解。我们在本注记的第1部分证明:点s 0∈ S上的纤维π− 1(s 0)是f的Remmert商,且仅当上的每个全纯函数(定义在该纤维的例外子簇的邻域中)都可以全纯延拓到。这是真的,例如,在以下情况下:flat,S约化在s 0和dim,= const对所有s∈ S。在第二部分中,我们利用这个结果得到:对于亏格为g ≠ 2的任意Riemann曲面R,存在一个2维正规复解析奇点X,使得X的最小分辨率包含R作为例外子簇,并且在单位圆S={|S| < 1}其不能被吹落到X的变形。
Letbe a 1-convex holomorphic mapping between complex spacesresp. S, and letbe the blowingdown factorization ofover S. We prove in part 1 of the present note: The fiber π− 1 (s 0) over a point s 0∈ S is the Remmert quotient ofif and only if every holomorphic function on(defined in a neighborhood of the exceptional subvariety of that fiber) can be extended holomorphically to. This is true, for instance, in the case:flat, S reduced at s 0 and dim,= const for all s∈ S. In part 2, we use this result to obtain the following: For any Riemann surface R with genus g⩾ 2 there exists a 2-dimensional normal complex analytic singularity X such that the minimal resolutionof X contains R as exceptional subvariety, andhas a deformation over the unit disc S={| s|< 1} which can not be blown down to a deformation of X.