On a Boundary Value Problem for a Third-Order Equation of the Parabolic–Hyperbolic Type in a Triangular Domain with Three Type Change Lines

In this paper, we consider a boundary value problem for an equation of the parabolic–hyperbolic type in a triangular domain with three type change lines, where the characteristic of the first-order operator is parallel to the ordinate axis. A theorem on the existence and uniqueness of the solution of the problem is proved.

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