34C05 Topological structure of integral curves, singular points, limit cycles of ordinary differential equations 9002

34C07 Theory of limit cycles of polynomial and analytic vector fields (existence, uniqueness, bounds, Hilbert’s 16th problem and ramifications) for ordinary differential equations 1632

34C08 Ordinary differential equations and connections with real algebraic geometry (fewnomials, desingularization, zeros of abelian integrals, etc.) 378

34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations 7142