线性级数与分歧覆盖的存在性
代数几何
2007-05-23 v2
摘要
在本文中,我们利用线性级数的视角,特别是由极限线性级数的退化工具导出的结果,给出关于正特征下射影直线的分歧覆盖之存在与不存在的若干新结果。我们的结果既涉及分歧指数,也涉及更精细的单值群不变量,且第一类结果通过本质代数且与正特征相关的论证获得。
引用
@article{arxiv.math/0507096,
title = {Linear series and existence of branched covers},
author = {Brian Osserman},
journal= {arXiv preprint arXiv:math/0507096},
year = {2007}
}
备注
19 pages. Heavily revised. Non-sharp existence results removed, many examples added, and main theorem stated in stronger form with simpler proof, using the results of math.AG/0609118