American Mathematical Monthly · 1958 · 57 citations · 0 references
Natural SciencesMathematicsPhysicsDifferential EquationsMathematical PhysicsBoundary ConditionsBoundary-value ProblemsPartial Differential Equation ModelsPartial Differential EquationsSystems Of Differential EquationsVariational FormulationElliptic Partial Differential EquationsNonlinear Partial Differential EquationsParabolic Partial Differential EquationsPartial Differential Equation Systems