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Differential OperatorsContinuous SpectrumPartial DerivativeSchrodinger OperatorPeriodic CoefficientsElementary SubgroupInvariant SubspacesDifferential EquationsFree BoundaryDifferential OperatorEntire FunctionSelfadjoint OperatorsComplex PlaneFunctions of Exponential TypeBoundary Value ProblemError EstimatesDiscrete SpectrumOperator NormSelfadjoint OperatorSpectral Parameter
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