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
中科院分区:
文献类型:
--
作者:
Fei Ye;Tong Zhang;Zhixian Zhu
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].