Download Affine Berstein Problems and Monge-Ampere Equations by An-min Li PDF

By An-min Li

During this monograph, the interaction among geometry and partial differential equations (PDEs) is of specific curiosity. It provides a selfcontained advent to investigate within the final decade bearing on international difficulties within the idea of submanifolds, resulting in a few different types of Monge-Ampère equations.

From the methodical viewpoint, it introduces the answer of sure Monge-Ampère equations through geometric modeling options. the following geometric modeling ability the proper number of a normalization and its prompted geometry on a hypersurface outlined by way of a neighborhood strongly convex worldwide graph. For a greater realizing of the modeling thoughts, the authors provide a selfcontained precis of relative hypersurface idea, they derive very important PDEs (e.g. affine spheres, affine maximal surfaces, and the affine consistent suggest curvature equation). bearing on modeling innovations, emphasis is on rigorously established proofs and exemplary comparisons among diverse modelings.

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These facts and continuity arguments admit to restrict the investigations to the following situation: One fixes the origin and this way identifies An+1 with V , then we consider nondegenerate hypersurfaces with transversal position vector in V ; as before we denote the position vector again by x. 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).

We call Y : M → V the affine normal Gauß map and the hypersurface Y (M ) the affine normal indicatrix. The fact that both affine indicatrices have the same unimodular metric in particular implies that the affine conormal indicatrix is locally strongly convex if and only if the affine normal indicatrix is locally strongly convex. Affine Gauß maps and Euclidean structure. In the case rank B = n it is often convenient to consider the two hypersurfaces, defined from the affine Gauß maps, as follows: We consider a Euclidean inner product , : V × V → R on V and identify V and V ∗ as usual.

On a non-degenerate hypersurface, let U be an arbitrary conormal field; from U one can define the corresponding metric h and the projectively flat connection ∇∗ , and from this A and T . Define the symmetric (1,2) tensor field A as traceless part of A: A(v, w) := A(v, w) − n n+2 (T (v)w + T (w)v + h(v, w)T ); then (a) A is a gauge invariant; (b) A = A(e), thus A = 0 if and only if the hypersurface is a hyperquadric; (c) we calculate A 2 = A 2 − 3n2 n+2 T 2 . Here the norms are defined via the relative metric used.

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