Affine Bernstein Problems and Monge-Ampère Equations by An-Min Li, Ruiwei Xu, Udo Simon, Fang Jia

By An-Min Li, Ruiwei Xu, Udo Simon, Fang Jia

During this monograph, the interaction among geometry and partial differential equations (PDEs) is of specific curiosity. It offers a selfcontained creation to investigate within the final decade bearing on international difficulties within the idea of submanifolds, resulting in a few kinds of Monge-Ampère equations. From the methodical standpoint, it introduces the answer of yes Monge-Ampère equations through geometric modeling strategies. right here geometric modeling ability definitely the right selection of a normalization and its brought on geometry on a hypersurface outlined by means of an area strongly convex worldwide graph. For a greater knowing of the modeling recommendations, the authors supply a selfcontained precis of relative hypersurface concept, they derive very important PDEs (e.g. affine spheres, affine maximal surfaces, and the affine consistent suggest curvature equation). relating modeling options, emphasis is on rigorously established proofs and exemplary comparisons among various modelings.

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Let x be an immersed hypersurface in An+1 which locally is given as graph of a strictly convex C ∞ -function xn+1 = f x1 , · · ·, xn over a convex domain. a). 2) locally defines an improper affine sphere given as the graph of this solution. a) similarly locally defines a proper affine sphere. 8, namely that both classes of affine spheres are very large. 3 The Pick invariant on affine hyperspheres We recall a well known inequality for the Laplacian of the Pick invariant on affine hyperspheres. For n = 2 it first was obtained by W.

Corollary. The form B can be expressed in terms of G, A and their derivatives: Bjk = (κ − J) Gjk − 2 n Aljk, l . 76. , en+1 }. Another integration gives the hypersurface. Uniqueness Theorem. Let x, x : M → An+1 be two non-degenerate hypersurfaces such that G=G , A=A . Then x, x differ by a unimodular affine transformation; that means both hypersurfaces are equi-affinely equivalent. Existence Theorem. Let (M, G) be an n-dimensional semi-Riemannian manifold with metric G. Suppose that a symmetric cubic covariant tensor field Aijk ω i ω j ω k A= is given on M .

This concept is not only of interest from the geometric view point, but one can also apply it for the geometric solution of PDEs. Here we summarize the material necessary for our purposes. For details we refer to the two monographs [58] and [88], for a survey to [86]. For a unifying approach studying invariants that are independent of the choice of the normalization see [87]. In the following summary of the basic formulas we use the invariant and the local calculus; in this way we present the basic formulas from the affine hypersurface theories in three different terminologies, namely: in Chapter 2 Cartan’s calculus together with a standard local calculus, in Chapter 3 the invariant calculus of Koszul and again a local description.

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