23-3 Messoud Efendiev, Vitali Vougalter
Solvability of some Fredholm integro-differential equations with mixed diffusion in a square (194K, pdf) Jan 30, 23
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Abstract. We demonstrate the existence in the sense of sequences of solutions for some integro-differential type problems in a square in two dimensions with periodic boundary conditions containing the normal diffusion in one direction and the superdiffusion in the other direction in a constrained subspace of H^2 using the fixed point technique. The elliptic equation involves a second order differential operator satisfying the Fredholm property. It is established that, under the reasonable technical assumptions, the convergence in the appropriate function spaces of the integral kernels yields the existence and convergence in H_{0}^{2} of the solutions. We generalize the results obtained in our preceding work [14] for the analogous equation considered in the whole R^2 which contained a non-Fredholm operator.

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