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arXiv 1104.5599math.AG
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关于包含projective varieties的超曲面

On hypersurfaces containing projective varieties

Euisung Park

摘要:

经典的Castelnuovo引理证明了余维数为$c$的非退化不可约射影簇的线性无关二次方程的个数至多为${{c+1} \choose {2}}$,且等式成立当且仅当该簇为极小次簇.本文还推广了G.法诺暗示下一个情况发生当且仅当该品种是一个德尔佩佐品种。对于曲线情形,J.Harris和S.拉沃夫斯基本文的目的是将这些结果推广到任意维簇和下一个情况。

英文摘要:

Classical Castelnuovo's Lemma shows that the number of linearly independent quadratic equations of a nondegenerate irreducible projective variety of codimension $c$ is at most ${{c+1} \choose {2}}$ and the equality is attained if and only if the variety is of minimal degree. Also a generalization of Castelnuovo's Lemma by G. Fano implies that the next case occurs if and only if the variety is a del Pezzo variety. For curve case, these results are extended to equations of arbitrary degree respectively by J. Harris and S. L'vovsky. This paper is intended to extend these results to arbitrary dimensional varieties and to the next cases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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