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 offers a selfcontained creation to analyze within the final decade bearing on international difficulties within the thought of submanifolds, resulting in a few different types of Monge-Ampère equations.

From the methodical standpoint, it introduces the answer of yes Monge-Ampère equations through geometric modeling suggestions. right here geometric modeling potential definitely the right collection of a normalization and its prompted geometry on a hypersurface outlined by way of a neighborhood strongly convex international graph. For a greater figuring out of the modeling strategies, the authors provide 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). touching on modeling suggestions, emphasis is on rigorously based proofs and exemplary comparisons among diversified modelings.

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Extra info for Affine Berstein Problems and Monge-Ampere Equations

Example text

Akij Uk − Bij U. 4 The affine support function Definition. Let b be a fixed vector in V . The function Λ : M → R defined by Λ(p) := U, b − x(p) , p ∈ M, is called the affine support function relative to the vector b ∈ Rn+1 . The support function satisfies PDEs that play an important role for global investigations. We are going to compute the Laplacian of Λ. Let dΛ = Λi ω i . From the definition of the conormal it follows that dΛ = dU, b − x − U, dx = Ui , b − x ω i . Hence Λi = U i , b − x . We calculate the second covariant derivative (called the covariant Hessian of Λ(x)) Λ,ij ω j = dΛi − ωij Λj = dUi , b − x − Ui , dx − = dUi − = ωij Λj ωij Uj , b − x − Ui , ej ω j ( U,ij , b − x − Ui , ej ) ω j .

We call the symmetric quadratic form B (equi)-affine Weingarten form. The symmetry of B implies that the associated operator B , implicitly defined by G(B v, w) := B(v, w), is self adjoint with respect to the Blaschke metric G; it is called the (equi)-affine shape or Weingarten operator. On locally strongly convex hypersurfaces, where G is (positive) definite, the eigenvalues λ1 , λ2 , · · · , λn of B are real; they are unimodular invariants and are called (equi)affine principal curvatures. The associated eigendirections are called (equi)-affine principal curvature directions.

I The equations (e)-(h) between the linear differentiable forms ω i , ωij , ωn+1 are sufficient for the integration of the systems (a)-(d). Proof. 1. Terminology. In the terminology of moving frames the integrability conditions (e)-(h) are called structure equations, which means that they are necessary and sufficient for the existence of the hypersurface structure. 5in ws-book975x65 Affine Bernstein Problems and Monge-Amp` ere Equations equations, as their coefficients contain all information on the geometry of the hypersurface.

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