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arXiv 1301.7315math.AG
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1-形式的一个最优扩张定理与Lipman-Zerkki猜想

An optimal extension theorem for 1-forms and the Lipman-Zariski conjecture

Patrick Graf, Sándor J Kovács

摘要:

设$X$是一个正规簇.假设对于简化除子$D \subset X$,在$(X, D)$的snc位点上定义的对数1-形式作为对数微分形式扩展到对数分辨率$\tilde X \to X$。我们证明了Lipman-Zerkki猜想对$X$成立。如果$X$具有对数正则奇点,则该结果尤其适用。此外,我们给出了一个例子的2-形式定义在一个三维的日志典型对$(X, \emptyset)$的光滑轨迹上,它获得了对数极点沿异常因子的差异为零,从而改进了一个类似的例子Greb,Kebekus,Kovács和Peternell。

英文摘要:

Let $X$ be a normal variety. Assume that for some reduced divisor $D \subset X$, logarithmic 1-forms defined on the snc locus of $(X, D)$ extend to a log resolution $\tilde X \to X$ as logarithmic differential forms. We prove that then the Lipman-Zariski conjecture holds for $X$. This result applies in particular if $X$ has log canonical singularities. Furthermore, we give an example of a 2-form defined on the smooth locus of a three-dimensional log canonical pair $(X, \emptyset)$ which acquires a logarithmic pole along an exceptional divisor of discrepancy zero, thereby improving on a similar example of Greb, Kebekus, Kovács and Peternell.

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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