34Cxx Qualitative theory

34C05  Location of integral curves, singular points, limit cycles
34C10  Oscillation theory, zeros, disconjugacy and comparison
               theory
34C11  Growth, boundedness, comparison of solutions
34C15  Nonlinear oscillations
34C20  Transformation and reduction of equations and systems,
               normal forms
34C23  Bifurcation See mainly{58F14}
34C25  Periodic solutions
34C27  Almost-periodic solutions
34C28  Other types of ``recurrent'' solutions
34C29  Averaging method
34C30  Manifolds of solutions
34C35  Dynamical systems, See also {54H20, 58Fxx, 70-XX}
34C37  Homoclinic and heteroclinic solutions, See also {58F15}
34C40  Equations and systems on manifolds See mainly{58Fxx,
               58Gxx}
34C45  Method of integral manifolds
34C50  Method of accelerated convergence
34C99  None of the above but in this section