Varieties with small dual varieties, I
Varieties with small dual varieties, I
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品种有小双品种,我
DOI:
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发表时间:
1986
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通讯作者:
L. Ein
中科院分区:
文献类型:
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作者:
L. Ein
Let X be a complex projective nonlinear n-fold in IP". Let X*_IP m be the dual variety of X. Landman defines the defect of X to be def(X)=N-1- dimX*. For most examples, def(X)=0 (i.e. X* is a hypersurface). The main purpose of this paper is to investigate those varieties with positive defect. Assume that def(X)=k>0. Let H be a general tangent hyperplane of X. The contact locus of H with X is a k dimensional linear space L in X [15]. We show that