A Plücker formula for singular projective varieties

A Plücker formula for singular projective varieties
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奇异射影簇的普吕克公式

DOI:
10.1080/00927879708826029
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发表时间:
1997
影响因子:
0.7
通讯作者:
Lars Ernström
Lars Ernström
中科院分区:
数学3区
文献类型:
--
作者:
Lars Ernström

文献摘要

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我们证明了具有任意奇异点的射影变量X的一个Plucker公式,它用X的欧拉特征和X的两个线性部分的欧拉特征来表示X的类,即对偶变量的度。此外,我们证明了没有任何公式可以将这个度表示为两项的差、变形不变量和奇异点的校正。
We prove a Plucker formula,for a projective variety X with arbitrary singularities, which expresses the class of X, the degree of the dual variety, in terms of Euler characteristics of X and of two linear sections of X. Moreover, we show that there is no formula whatsoever expressing this degree as a difference of two terms, a deformation invariant and a correction for singularities.