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arXiv math/0005142math.AGmath.ACmath.RA
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余维2中完全交的两个简单判别法

On two simple criteria for recognizing complete intersections in codimension 2

Alessandro Arsie

摘要:

发展了Faltings的一个思想,我们刻画了P^n,n ≥ 3中余维2在任意特征的代数闭域上的完全交,其中l.c.i. X,作为那些亚正则和scheme-theoretically定义的p<=n-1方程。此外,在假设X的法丛扩张到P^n上的数值分裂丛,p<=n,且基场的特征为零的条件下,我们给出了其它一些结果.最后,对Franco,Kleiman和Lascu最近提出的一个关于正特征自联和完全交的问题给出了(部分)回答.

英文摘要:

Developing a previous idea of Faltings, we characterize the complete intersections of codimension 2 in P^n, n>=3, over an algebraically closed field of any characteristic, among l.c.i. X, as those that are subcanonical and scheme-theoretically defined by p<=n-1 equations. Moreover, we give some other results assuming that the normal bundle of X extends to a numerically split bundle on P^n, p<=n and the characteristic of the base field is zero. Finally, we give a (partial) answer to a question posed recently by Franco, Kleiman and Lascu on self-linking and complete intersections in positive characteristic.

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