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Differential EquationsDifferentialRiemann BoundaryGeneralized FunctionDirichlet SeriesVariation InequalitiesNeumann AlgebrasOrthogonal SeriesITS ApplicationEntire FunctionPeriodic CoefficientsTrigonometric SeriesRiemann SpaceExistence and UniquenessMixed Type EquationProblem SolutionsIntegral MetricsHyperbolic SystemHypersingular IntegralsFourier Coefficients