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On the differentiability of the solutions of non-local Isaacs equations involving \(\frac{1}{2}\)-Laplacian. (English) Zbl 1334.35381

Summary: We derive \(C^{1,\sigma}\)-estimate for the solutions of a class of non-local elliptic Bellman-Isaacs equations. These equations are fully nonlinear and are associated with infinite horizon stochastic differential game problems involving jump-diffusions. The non-locality is represented by the presence of fractional order diffusion term and we deal with the particular case of \(\frac 12\)-Laplacian, where the order \(\frac 12\) is known as the critical order in this context. More importantly, these equations are not translation invariant and we prove that the viscosity solutions of such equations are \(C^{1,\sigma}\), making the equations classically solvable.

MSC:

35R11 Fractional partial differential equations
35F21 Hamilton-Jacobi equations
45K05 Integro-partial differential equations
49L20 Dynamic programming in optimal control and differential games
49L25 Viscosity solutions to Hamilton-Jacobi equations in optimal control and differential games
91A23 Differential games (aspects of game theory)
35R09 Integro-partial differential equations

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