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arXiv 2007.06519math.AG
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正规曲面上Zebrski分解的积分形式

An integral version of Zariski decompositions on normal surfaces

Makoto Enokizono

摘要:

我们证明了正规曲面上的伪有效因子可以分解为“积分正”部分和“积分负”部分,这是Zebraki分解的积分模拟。利用这种分解,我们给出了三个应用:曲面上因子的消失定理(Kawamata-Viehweg和Miyaoka消灭定理的推广),曲面上伴随线性系的Reider型定理(包括原系统的对数形式和相对形式)和曲面上曲线上态射的扩张定理(Serrano和Paoletti结果的推广).

英文摘要:

We show that any pseudo-effective divisor on a normal surface decomposes uniquely into its "integral positive" part and "integral negative" part, which is an integral analog of Zariski decompositions. By using this decomposition, we give three applications: a vanishing theorem of divisors on surfaces (a generalization of Kawamata-Viehweg and Miyaoka vanishing theorems), Reider-type theorems of adjoint linear systems on surfaces (including a log version and a relative version of the original one) and extension theorems of morphisms defined on curves on surfaces (generalizations of Serrano and Paoletti's results).

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