Geometry Topology

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

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 analyze within the final decade touching on worldwide difficulties within the concept of submanifolds, resulting in a few sorts of Monge-Ampère equations. From the methodical perspective, it introduces the answer of convinced Monge-Ampère equations through geometric modeling ideas. the following geometric modeling potential the fitting collection of a normalization and its precipitated geometry on a hypersurface outlined via an area strongly convex worldwide graph. For a greater knowing of the modeling suggestions, the authors supply a selfcontained precis of relative hypersurface idea, they derive vital PDEs (e.g. affine spheres, affine maximal surfaces, and the affine consistent suggest curvature equation). bearing on modeling thoughts, emphasis is on conscientiously based proofs and exemplary comparisons among assorted modelings.

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Let µ and λ denote the largest and smallest eigenvalues of the product matrix C τ C, respectively; they are positive. Then λds2 ≤ d¯ s2 ≤ µds2 . This means that a curve in M has infinite length in one metric if and only if its length is infinite in the other metric.

We call a hypersurface with always transversal position vector centroaffine; see pp. 15 and 37-39 in [73]. For such a hypersurface one can choose Y (c) := εx as relative normal where ε = +1 or ε = −1 is chosen appropriately (see below). The conormal U (c) is oriented always such that U (c) , Y (c) = 1. We recall the following definitions. A locally strongly convex, centroaffine hypersurface is called to be of (i) hyperbolic type, if, for any point x(p) ∈ V , the origin 0 ∈ V and the hypersurface are on different sides of the affine tangent hyperplane dx(Tp M ); the centroaffine normal vector field then is given by Y (c) := +x (examples are hyperbolic affine hyperspheres in Rn+1 centered at 0 ∈ Rn+1 ); according to the choice Y (c) = x we modify the definition of the support functions and set Λ := U, x ; (ii) elliptic type, if, for any point x(p) ∈ V , the origin 0 ∈ V and the hypersurface are on the same side of the affine tangent hyperplane dx(Tp M ); now the centroaffine normal vector field is given by Y (c) := − x (examples are elliptic affine hyperspheres in Rn+1 centered at 0 ∈ Rn+1 ).

A) where L1 is a constant. We summarize the foregoing results: Theorem. 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.

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