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arXiv 0903.0679math.AG
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环面弱Fano 3-重的Nef因子和大因子

Nef and big divisors on toric weak Fano 3-folds

Shoetsu Ogata

摘要:

我们证明了在非奇异环面弱Fano 3-fold上,伴随丛具有非零整体瓣的nef大线丛是正规生成的。结果表明,非奇异环面弱Fano 3-fold上的所有充裕线丛都是正规生成的。我们还表明,一个丰富的线丛,其伴随丛有非零的整体瓣上的Gorensein复曲面Fano 3倍正常产生。在我们的证明中,我们不使用Fano多面体的完全分类。

英文摘要:

We show that a nef and big line bundle whose adjoint bundle has non-zero global sections on a nonsingular toric weak Fano 3-fold is normally generated. As a consequence, we see that all ample line bundles on a nonsingular toric weak Fano 3-fold are normally generated. We also show that an ample line bundle whose adjoint bundle has non-zero global sections on a Gorensein toric Fano 3-fold is normally generated. In our proof we do not use full classifications of Fano polytopes.

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