Convexity of the smallest principal curvature of the convex level sets of some quasi-linear elliptic equations with respect to the height

Details Convexity of the smallest principal curvature of the convex level sets of some quasi-linear elliptic equations with respect to the height Convexity of the smallest principal curvature of the convex level sets of some quasi-linear elliptic equations with respect to the height

2010-05-10

arxiv.org/abs/1005.1515v1

Mathematics

Analysis of PDEs

26pages

Scientific paper

For the $p$-harmonic function with strictly convex level sets, we find a test function which comes from the combination of the norm of gradient of the $p$-harmonic function and the smallest principal curvature of the level sets of $p$-harmonic function. We prove that this curvature function is convex with respect to the height of the $p$-harmonic function. This test function is an affine function of the height when the $p$-harmonic function is the $p$-Green function on the ball. For the minimal graph, we obtain a similar results.

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