Games for eigenvalues of the Hessian and concave/convex envelopes

By Pablo Blanc, Julio D. Rossi. Journal des Mathématiques Pures et Appliquées, 2018

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We study the PDE $\lambda_j(D^2 u) = 0$, in $\Omega$, with $u=g$, on $\partial \Omega$. Here $\lambda_1(D^2 u) \leq ... \leq \lambda_N (D^2 u)$ are the ordered eigenvalues of the Hessian $D^2 u$. First, we show a geometric interpretation of the viscosity solutions to the problem in terms of convex/concave envelopes over affine spaces of dimension $j$. In one of our main results, we give necessary and sufficient conditions on the domain so that the problem has a continuous solution for every continuous datum $g$. Next, we introduce a two-player zero-sum game whose values approximate solutions to this PDE problem. In addition, we show an asymptotic mean value characterization for the solution the the PDE.

Subfields: Applied Mathematics

View Paper: https://www.semanticscholar.org/paper/5b2da2c82e4fda573ecdfb74cd6fb28a0d744e43