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arXiv 1803.00535math.AG
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实非奇异三次三重线的变形分类

Deformation classification of real non-singular cubic threefolds with a marked line

Sergey Finashin, Viatcheslav Kharlamov

摘要:

证明了实非奇异三次超曲面$X\subset P^4$与实直线$l\subset X$构成的对空间$(X,l)$有18个连通分支,并给出了几个相当明确的解释.第一个涉及到这些组件的轨道上的单值作用的Fano表面$F_\mathbb{R}(X)$的连接组件的集合上形成的实线$X$。对于另一种解释,我们与每个18个组件的一个定义良好的真正的非奇异平面五次曲线的变形类,并表明这种变形类连同真正的变形类的$X$特征完全组件。

英文摘要:

We prove that the space of pairs $(X,l)$ formed by a real non-singular cubic hypersurface $X\subset P^4$ with a real line $l\subset X$ has 18 connected components and give for them several quite explicit interpretations. The first one relates these components to the orbits of the monodromy action on the set of connected components of the Fano surface $F_\mathbb{R}(X)$ formed by real lines on $X$. For another interpretation we associate with each of the 18 components a well defined real deformation class of real non-singular plane quintic curves and show that this deformation class together with the real deformation class of $X$ characterizes completely the component.

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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