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Lower Bounds for Eigenvalues of Elliptic Operators: By Nonconforming Finite Element Methods

Numerical AnalysisSpectral TheoryFinite Element MethodElliptic EquationEngineeringRiemann-hilbert ProblemFinite Element MethodsElliptic OperatorsFunctional AnalysisApproximation TheoryBoundary Element MethodLower BoundsElliptic Function