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arXiv 1108.0897math.AG
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射线正流形的几何

Geometry of rays-positive manifolds

Mauro C. Beltrametti, Andreas Leopold Knutsen, Antonio Lanteri, Carla Novelli

摘要:

设M是光滑复射影簇,L是其上的线丛,研究了射线正流形,即对(M,L),使得L是数值有效的,且对M上的所有极值射线R,L \cdotR > 0.提供了几个说明性的例子和一些应用。特别地,对余维数小且具有可裂奇点的射影簇进行了分类,证明了截亏格g(M,L)的非负性,并描述了g(M,L)= 0,1的对.

英文摘要:

Let M be a smooth complex projective variety and let L be a line bundle on it. Rays-positive manifolds, namely pairs (M,L) such that L is numerically effective and L\cdotR > 0 for all extremal rays R on M, are studied. Several illustrative examples and some applications are provided. In particular, projective varieties with crepant singularities and of small degree with respect to the codimension are classified, and the non-negativity of the sectional genus g(M,L) is proven, describing as well the pairs with g(M,L) = 0,1.

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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