A device for increase of boundary value problem solution accuracy comprises a comparing unit, a recording unit, an initial information input unit, which first output is connected to the input of interval set unit, the second output of the initial information input unit is connected to the input of a boundary data unit and the third output of the initial information input unit is connected to the input of a set unit of physical field sources. The device comprises a unit for generation of direct problem coordinate functions, a unit for generation of dual problem coordinate functions, an admissible error set unit, a unit for generation of direct problem solution, a unit for generation of dual problem solution, an error evaluator.
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