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arXiv alg-geom/9502012alg-geommath.AG
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Del Pezzo曲面上的k-非常充足线丛

k-very ample line bundles on Del Pezzo Surfaces

Sandra Di Rocco

摘要:

对Del Pezzo曲面上的$k$ -非常充分线丛L进行了数值刻画.我们发现,具有自交零点的例外曲线和有效因子的集合$\cal S$,在判定Del pezzo曲面上的线丛的nefness和$k$ -very ampleness中起着非常重要的作用.我们证明了线丛L是nef的当且仅当它是张成的,并且L是$k$ -非常充分的当且仅当与$\cal S$的所有元素的交大于或等于k。在本文的第一部分中,我们给出了一个完整的数值描述的元素的$\cal S$。

英文摘要:

A $k$-very ample line bundle L on a Del Pezzo Surface is numerically characterized. We find that the set of the exceptional curves and effective divisors with selfintersection zero, $\cal S$, plays a very important rule in checking the nefness and $k$-very ampleness of a line bundle on a Del pezzo Surface. We show that a line bundle L is nef if and only if it is spanned and that L is $k$-very ample if and only if the intersection with all the elements of $\cal S$ is greater or equal than k. In the first part of the paper we give a complete numerical description of the elements of $\cal S$ .

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