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Journal of Convex Analysis 18 (2011), No. 4, 1141--1170
Copyright Heldermann Verlag 2011

An Integro-Extremization Approach for Non Coercive and Evolution Hamilton-Jacobi Equations

Sandro Zagatti
SISSA, Via Bonomea 265, 34136 Trieste, Italy


We devote the \textit{integro-extremization} method to the study of the Dirichlet problem for homogeneous Hamilton-Jacobi equations \begin{displaymath} \begin{cases} F(Du)=0 & \quad \textrm{in} \quad\O\cr u(x)=\varphi(x) & \quad \textrm{for} \quad x\in \partial \O, \end{cases} \end{displaymath} with a particular interest for non coercive hamiltonians $F$, and to the Cauchy-Dirichlet problem for the corresponding homogeneous time-dependent equations \begin{displaymath} \begin{cases} \frac{\partial u}{\partial t}+ F(\nabla u)=0 & \quad \textrm{in} \quad ]0,T[\times \O\cr u(0,x)=\eta(x) & \quad \textrm{for} \quad x\in\O \cr u(t,x)=\psi(x) & \quad \textrm{for} \quad (t,x)\in[0,T]\times \partial \O. \end{cases} \end{displaymath} We prove existence and some qualitative results for viscosity and almost everywhere solutions, under suitably convexity conditions on the hamiltonian $F$, on the domain $\O$ and on the boundary datum, without any growth assumptions on $F$.

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