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arXiv math/0106219math.APmath.DG
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关于边界上具有临界非线性的几何方程

On a geometric equation with critical nonlinearity on the boundary

Veronica Felli, Mohameden Ould Ahmedou

摘要:

Escobar的一个定理断言,在具有与标准三维球不共形等价的边界的正三维光滑紧致黎曼流形上,$C^2$函数$H$是某个共形平坦度量的中曲率的充要条件是$H$在某处为正。我们证明了,当边界是脐点且函数$H$处处为正时,所有度量关于$C^2$范数都保持在一个紧集中,且所有解的全次数等于-1.

英文摘要:

A theorem of Escobar asserts that, on a positive three dimensional smooth compact Riemannian manifold with boundary which is not conformally equivalent to the standard three dimensional ball, a necessary and sufficient condition for a $C^2$ function $H$ to be the mean curvature of some conformal flat metric is that $H$ is positive somewhere. We show that, when the boundary is umbilic and the function $H$ is positive everywhere, all such metrics stay in a compact set with respect to the $C^2$ norm and the total degree of all solutions is equal to -1.

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