On Plurigenera of Normal Isolated Singularities II
On Plurigenera of Normal Isolated Singularities II
复制标题
论正态孤立奇点的多属性 II
DOI:
10.2969/aspm/00810671
复制
发表时间:
1987
期刊:
影响因子:
--
通讯作者:
Kimio Watanabe
中科院分区:
文献类型:
--
作者:
Kimio Watanabe
In this paper we prove some results on plurigenera of normal isolated singularities. This paper is a continuation of [19]. In Section 1, we recall some preliminary facts related to the concept of plurigenera of normal isolated singularities. In Section 2, we prove the Om-formula for non-degenerate hypersurface isolated singularities, which is a generalization of Theorem 1.13 [19, p. 71]. In Section 3, we determine the "type" of purely elliptic singularities of hypersurfaces. In the last section we show a criterion for a singularity to be Du Bois: In the case where a singularity is quasi-Gorenstein, a singularity (X, x) is Du Bois if and only if o <om(X, x) < 1. Finally we give examples of Du Bois singularities with possibly positive geometric genera, which are not quasiGorenstein.