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Support-operator finite-difference algorithms for general elliptic problems. (English) Zbl 0824.65101
The authors develop an algorithm for solving linear second-order boundary value problems with general mixed boundary conditions. It is assumed that there exists a mapping of the considered domain to a square. The proposed algorithm is a combination of the mapping method and the method of support operators [see, e.g., {\it A. P. Favorskii, A. A. Samarskii, M. Yu. Shashkov} and {\it V. F. Tishkin}, Differential Equations 17, 854-862 (1982; Zbl 0485.65060)]. First, the considered boundary value problem is transformed to a boundary value problem in a square. The new problem is of the same type as the original problem. Then, the support operator method is used to discretize the transformed problem on a uniform grid. The second-order accuracy of the method is shown by numerical examples.

65N06Finite difference methods (BVP of PDE)
65N15Error bounds (BVP of PDE)
35J25Second order elliptic equations, boundary value problems
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