Concepedia
Journal of the London Mathematical Society · 1978 · 85 citations · 0 references
Natural SciencesMathematicsPhysicsDifferential EquationsMathematical PhysicsBoundary ConditionsCharacteristic FunctionsEigenvalue ProblemsOperator TheorySpectral MethodsSpectral TheoryFredholm TheoryOperator ExtensionsOperator SemigroupsSturm - Liouville TheorySturm-liouville Theory