On the dimension of secant varieties

On the dimension of secant varieties
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关于割线簇的维数

DOI:
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
C. Ciliberto
C. Ciliberto
中科院分区:
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文献类型:
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作者:
L. Chiantini;C. Ciliberto

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在本文中,我们概括了 Zak 的切线定理和线性正态性定理以及 Zak 的 Severi 簇定义和分类。特别是,在 X 上适当的规律性假设下,我们发现给定品种 X 的较高割线品种的维数有明显的下界,并且我们对达到该界限的品种进行分类。
In this paper we generalize Zak�s theorems on tangencies and on linear normality as well as Zak�s definition and classification of Severi varieties. In particular we find sharp lower bounds for the dimension of higher secant varieties of a given variety X under suitable regularity assumptions on X, and we classify varieties for which the bound is attained.