On generators of ideals defining projective toric varieties

On generators of ideals defining projective toric varieties
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关于定义射影复曲面簇的理想生成器

DOI:
10.1007/s002290200252
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发表时间:
2002
影响因子:
0.6
通讯作者:
K. Nakagawa
K. Nakagawa
中科院分区:
数学4区
文献类型:
--
作者:
S. Ogata;K. Nakagawa

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对于n维射影环面上的任一充分线丛L,证明了如果大于或等于⊗1,则通常生成的线丛L是−i,并给出了例子说明这一估计是最佳可能的。此外,我们还证明了定义射影环簇的理想的生成元的次数的一个估计。特别地,当L是正常生成时,由L的全局段嵌入的簇的定义理想有n+1次生成元,当簇由L的⊗(n−1)的全局段嵌入时,定义理想至多有3次生成元.
For any ample line bundleLon a projective toric variety of dimensionn, it is proved that the line bundleL⊗iis normally generated ifiis greater than or equal ton−1, and examples showing that this estimate is best possible are given. Moreover we prove an estimate for the degree of the generators of the ideals defining projective toric varieties. In particular, whenLis normally generated, the defining ideal of the variety embedded by the global sections ofLhas generators of degree at mostn+1. When the variety is embedded by the global sections ofL⊗(n−1), then the defining ideal has generators of degree at most three.
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