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
中科院分区:
文献类型:
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作者:
S. Ogata;K. Nakagawa
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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