On k-Jet Ampleness
On k-Jet Ampleness
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DOI:
10.1007/978-1-4757-9771-8_15
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发表时间:
1993
期刊:
影响因子:
--
通讯作者:
Mauro C. Beltrametti;Andrew J. Sommese
中科院分区:
文献类型:
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作者:
Mauro C. Beltrametti;Andrew J. Sommese
LetXbe ann-dimensional projective manifold mapped into a projective spaceΨ:X→ ℙℂ. LetLbe the pullback,Ψ*Oℙℂ(1), of the hyperplane section bundle. IfΨis an embedding,Lis said to be very ample. This is an intensively studied and well-understood concept. In this chapter we study a particular notion of higher-order embedding. We say thatLisk-jet amplefor a nonnegative integerkif, given anyrintegersk1, .,kr, such thatand anyrdistinct points{x1,.. .,xr}⊂X, the evaluation mapis surjective, wheremxi.denotes the maximal ideal atxt.Note thatLis spanned (respectively, very ample) if and only ifLis 0-jet ample (respectively, 1-jet ample).