American Mathematical Monthly · 1964 · 192 citations · 0 references
Natural SciencesMathematicsDifferential EquationsBoundary ConditionsIntegral Equation FormulationsIntegral EquationsOperator TheoryPartial Differential EquationsVariational FormulationFredholm Integral EquationsFredholm TheoryLinear Integral EquationsLinear Partial Differential EquationsOperators