Abstract
We propose and analyze a two-scale finite element method for the Isaacs equation. The fine scale is given by the mesh sizehwhereas the coarse scaleεis dictated by an integro-differential approximation of the partial differential equation. We show that the method satisfies the discrete maximum principle provided that the mesh is weakly acute. This, in conjunction with weak operator consistency of the finite element method, allows us to establish convergence of the numerical solution to the viscosity solution asε,h→ 0, andε ≳ (h|logh|)1/2. In addition, using a discrete Alexandrov Bakelman Pucci estimate we deduce rates of convergence, under suitable smoothness assumptions on the exact solution.
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