American Mathematical Monthly · 1970 · 20 citations · 0 references
Natural SciencesMathematicsPhysicsMathematical PhysicsProbability TheoryTheoretical PhysicsEigenvalue ProblemsHilbert Space FormalismOperator TheorySpectral AnalysisSpectral MethodsSpectral TheoryHilbert Space OperatorsHilbert Space RepresentationsSpectral DecompositionSpectral RepresentationSpectral Theorem