Sakai’s theorem for $\mathbb{Q}$-divisors on surfaces and applications

Sakai’s theorem for $\mathbb{Q}$-divisors on surfaces and applications
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表面和应用上 $mathbb{Q}$-约数的 Sakai 定理

DOI:
10.4310/ajm.2018.v22.n4.a8
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发表时间:
2018
影响因子:
0.6
通讯作者:
Zhixian Zhu
Zhixian Zhu
中科院分区:
数学4区
文献类型:
--
作者:
Fei Ye;Tong Zhang;Zhixian Zhu

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本文给出了光滑空间上大Q-因子D的一个刻划 具有D2>0且H1(OS(−D))=0的射影曲面S推广了Sakai的一个结果 [Sak90]表示D积分。作为这一结果在q-因子上的应用,我们证明了伴随线性系统|KS+D|的无基点和非常扩张性的结果。这些结果可以被视为 对先前Ein-Lazarsfeld[EL93]和Ma AgeSek[Ma AgeS99]光滑曲面的结果进行了改进。
In this paper, we present a characterization of a big Q-divisor D on a smooth projective surface S with D2 > 0 and H1(OS(−D)) = 0, which generalizes a result of Sakai [Sak90] for D integral. As applications of this result for Q-divisors, we prove results on base-pointfreeness and very-ampleness of the adjoint linear system |KS + D|. These results can be viewed as refinements of previous results on smooth surfaces of Ein-Lazarsfeld [EL93] and Ma¸sek [Ma¸s99].