Journal of the London Mathematical Society · 1955 · 53 citations · 0 references
Natural SciencesMathematicsPhysicsDifferential EquationsDynamical SystemsIntegrable SystemsNonlinear DynamicsPartial Differential EquationsSystems Of Differential EquationsElliptic Partial Differential EquationsIntegrable Partial Differential EquationsNonlinear Initial Value ProblemsSecond-order Differential EquationsSturm - Liouville Theory