Local cohomological dimension of algebraic varieties

Local cohomological dimension of algebraic varieties
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代数簇的局部上同调维数

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发表时间:
1973
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通讯作者:
A. Ogus
A. Ogus
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作者:
A. Ogus

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如果X是特征为零的光滑概型,Yc X是闭子集,我们找到了关于Y的奇点的拓扑条件,这些条件决定了局部上同调层Hf(F)的最佳可能消失定理,其中i > r和拟同调层F都是如此.应用包括计算的上同调维数Pn - Y的任意闭子集Y和扩展定理的莱夫谢茨和巴特的情况下,奇异品种。
If X is a smooth scheme of characteristic zero and Yc X is a closed subset, we find topological conditions on the singularities of Y which determine the best possible vanishing theorem for the sheaves of local cohomology Hf(F) for all i > r and all quasicoherent F. Applications include computation of the cohomological dimension of Pn - Y for arbitrary closed subsets Y and extensions of theorems of Lefschetz and Barth to the case of singular varieties.