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arXiv math/0504393math.DG
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函数的水平集与光滑曲面截面的对称集

Level sets of functions and symmetry sets of smooth surface sections

Andre Diatta, Peter Giblin, Brendan Guilfoyle, Wilhelm Klingenberg

摘要:

证明了二元实C ^s函数在非退化临界点附近的水平集是C ^[s/2]类的,并将其应用于研究曲面在双曲点或椭圆点,特别是脐点处切平面的奇异截面.我们还分析了来自退化临界点的情况,对应于曲面上高斯的椭圆尖点,其中可微性现在减少到C ^[s/4]。然而,在我们对平面曲线族的对称集的所有应用中,我们假设C ^infty光滑。

英文摘要:

We prove that the level sets of a real C^s function of two variables near a non-degenerate critical point are of class C^[s/2] and apply this to the study of planar sections of surfaces close to the singular section by the tangent plane at hyperbolic points or elliptic points, and in particular at umbilic points. We also analyse the cases coming from degenerate critical points, corresponding to elliptic cusps of Gauss on a surface, where the differentiability is now reduced to C^[s/4]. However in all our applications to symmetry sets of families of plane curves, we assume the C^infty smoothness.

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