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arXiv 1709.02178math.DG
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欧几里得空间中作为超曲面的完备平坦面

Complete flat fronts as hypersurfaces in Euclidean space

Atsufumi Honda

摘要:

根据Hartman-Nirenberg定理,欧几里得空间中的完备平坦超曲面必是平面曲线上的柱面.然而,如果我们承认一些奇异性,则有许多非平凡的例子。平坦面是具有容许奇点的平坦超曲面。Murata-Umehara给出了欧氏$3$ -空间中具有非空奇异集的完备平坦锋的表示公式,并证明了四顶点型定理.本文证明了在欧氏$(n+1)$ -空间$(n\geq 3)$中不存在具有非空奇异集的完全平坦锋,这与$n=2$的情形不同.

英文摘要:

By Hartman--Nirenberg's theorem, any complete flat hypersurface in Euclidean space must be a cylinder over a plane curve. However, if we admit some singularities, there are many non-trivial examples. Flat fronts are flat hypersurfaces with admissible singularities. Murata--Umehara gave a representation formula for complete flat fronts with non-empty singular set in Euclidean $3$-space, and proved the four vertex type theorem. In this paper, we prove that, unlike the case of $n=2$, there do not exist any complete flat fronts with non-empty singular set in Euclidean $(n+1)$-space $(n\geq 3)$.

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