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
中科院分区:
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作者:
L. Chiantini;C. Ciliberto
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.