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arXiv 0812.3454math.AG
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正规素除子上的Kodaira-Iitaka维数

Kodaira-Iitaka Dimension on a Normal Prime Divisor

Travis Kopp

摘要:

本文受T. Peternell,M. Schneider和A. J. Sommese关于子变种的Kodaira维度。在它我发现之间的Kodaira-Iitaka维数的一个因子的正规簇和相关的因子上的一个不可约的正规子簇的余维1。主要结果可以简化为:对$X$是完全正规簇,$Y \sub X$是不可约完全正规因子,$\sL$是$X$上的可逆层,存在整数$n_1 > 0, n_2 \geq 0$,对它有$κ(X,\sL) - 1 \leq κ(Y,\sL^{n_1}(-n_2Y)|_Y)$,其中,如果$Y$不是$\sL$的大张量幂的固定分量,我们可以取$n_1 >> n_2$ .这对Kodaira-Iitaka维数在任何余维的子变种上有影响。

英文摘要:

This paper was inspired by work by T. Peternell, M. Schneider and A.J. Sommese on the Kodaira dimension of subvarieties. In it I find a relation between the Kodaira-Iitaka dimension of a divisor on a normal variety and that of related divisors on an irreducible normal subvariety of codimension one. The main result may be stated in a simplified form as: For $X$ a complete normal variety, $Y \sub X$ an irreducible complete normal divisor and $\sL$ an invertible sheaf on $X$, there exist integers $n_1 > 0, n_2 \geq 0$ for which $κ(X,\sL) - 1 \leq κ(Y,\sL^{n_1}(-n_2Y)|_Y)$, where, if $Y$ is not a fixed component of large tensor powers of $\sL$, we may take $n_1 >> n_2$. This has implications for Kodaira-Iitaka dimension on a subvariety of any codimension.

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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