34cxx37cxx37dxx37exx37nxx70kxx 37cxx37dxx37bxx34cxx34dxx applications chaoticbehaviorinsystems differentiabledynamicalsystems differentialequations dynamicalsystemsandergodictheory dynamics exponentialfunctions low-dimensionaldynamicalsystems mechanicsofparticlesandsystems nonlinear nonlineardynamics nonlineartheories ordinarydifferentialequations qualitativetheory smoothdynamicalsystems:generaltheory stabilitytheory topologicaldynamics