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arXiv 1003.4648math.AG
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有理曲面上$(-4)$ -曲线的偶集

Even sets of $(-4)$-curves on rational surface

Maria Marti Sanchez

摘要:

本文研究了具有一组偶的不相交$(-4)$ -曲线的有理曲面。研究了偶集上双覆盖分枝曲面$S$的性质。它示出,相反,发生什么事,甚至集的$(-2)$ -曲线,曲线的数量在一个偶数集的$(-4)$ -曲线是有界的(小于或等于12)。曲面$S$总是具有大于或等于零的Kodaira维数,并且完全表征了Kodaira维数为零和1的情况。列举了这种情况的几个例子。

英文摘要:

We study rational surfaces having an even set of disjoint $(-4)$-curves. The properties of the surface $S$ obtained by considering the double cover branched on the even set are studied. It is shown, that contrarily to what happens for even sets of $(-2)$-curves, the number of curves in an even set of $(-4)$-curves is bounded (less or equal to 12). The surface $S$ has always Kodaira dimension bigger or equal to zero and the cases of Kodaira dimension zero and one are completely characterized. Several examples of this situation are given.

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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