In this paper, we discuss a probabilistic approach to construction of a viscosity solution of the Cauchy problem for a system of nonlinear parabolic equations. Our approach is based on reduction of the original problem to a system of quasilinear parabolic equation in the first step and to a system of fully coupled forward-backward stochastic differential equations in the second step. Solution of the stochastic problem allows us to construct a probabilistic representation of a viscosity solution of the original problem and state conditions which ensure the existence and uniqueness of this solution.
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Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 396, 2011, pp. 31-66.
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Belopolskaya, Y.I., Woyczynski, W.A. Probabilistic approach to viscosity solutions of the Cauchy problems for systems if fully nonlinear parabolic equations. J Math Sci 188, 655–672 (2013). https://doi.org/10.1007/s10958-013-1155-6
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DOI: https://doi.org/10.1007/s10958-013-1155-6