arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.01417math.AG
收藏

对数典范修正的存在性及其应用

Existence of log canonical modifications and its applications

Osamu Fujino, Kenta Hashizume

摘要:

本文的主要目的是从极小模型理论的观点出发,建立几种有用的偶奇点的部分分解。我们首先在适当的假设下证明了正规对的对数正则修改的存在性。它完全恢复了Kawakita关于对数正则性的附加逆。我们还讨论了半对数正则修改的存在性,并构造了具有一些额外好性质的dlt blow-ups。作为应用,我们研究了极值有理曲线的长度等。

英文摘要:

The main purpose of this paper is to establish some useful partial resolutions of singularities for pairs from the minimal model theoretic viewpoint. We first establish the existence of log canonical modifications of normal pairs under some suitable assumptions. It recovers Kawakita's inversion of adjunction on log canonicity in full generality. We also discuss the existence of semi-log canonical modifications for demi-normal pairs and construct dlt blow-ups with several extra good properties. As applications, we study lengths of extremal rational curves and so on.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑