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
中科院分区:
文献类型:
--
作者:
O. Riemenschneider
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.