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arXiv math/0012180math.AG
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曲面的对数轨道欧拉数及其应用

Logarithmic orbifold Euler numbers of surfaces with applications

Adrian Langer

摘要:

我们引入了带Q因子的法向曲面的轨道折叠欧拉数。这些数字的行为乘法有限映射和日志典型的情况下,我们证明了他们满足Bogomolov-Miyaoka-Yau型不等式。作为推论,我们证明了Bogomolov关于有理曲线在一般曲面上的有界性结果的有效形式.最后,我们给出了平面曲线奇异性的一些应用。

英文摘要:

We introduce orbifold Euler numbers for normal surfaces with Q-divisors. These numbers behave multiplicatively under finite maps and in the log canonical case we prove that they satisfy the Bogomolov-Miyaoka-Yau type inequality. As a corollary we prove effective versions of Bogomolov's result on boundedness of rational curves in some surfaces of general type. Finally, we give some applications to singularities of plane curves.

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。

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