34B07 Linear boundary value problems with nonlinear dependence on the spectral parameter

34B08 Parameter dependent boundary value problems

34B10 Nonlocal and multipoint boundary value problems

34B16 Singular nonlinear boundary value problems

34B18 Positive solutions of nonlinear boundary value problems

34B20 Weyl theory and its generalizations

34B24 Sturm-Liouville theory [See also <a href="#code:34Lxx">34Lxx</a>]

34B30 Special equations (Mathieu, Hill, Bessel, etc.)

34B37 Boundary value problems with impulses

34B40 Boundary value problems on infinite intervals

34B45 Boundary value problems on graphs and networks

34B99 None of the above, but in this section

34Cxx Qualitative theory [See also <a href="#code:37-XX">37-XX</a>]

34C05 Location of integral curves, singular points, limit cycles

34C07 Theory of limit cycles of polynomial and analytic vector fields (existence, uniqueness, bounds, Hilbert's 16th problem and ramifications)

34C08 Connections with real algebraic geometry (fewnomials, desingularization, zeros of Abelian integrals, etc.)

34C10 Oscillation theory, zeros, disconjugacy and comparison theory

34C15 Nonlinear oscillations, coupled oscillators

34C20 Transformation and reduction of equations and systems, normal forms

34C23 Bifurcation [See also <a href="#code:37Gxx">37Gxx</a>]

34C27 Almost and pseudo-almost periodic solutions

34C28 Complex behavior, chaotic systems [See also <a href="#code:37Dxx">37Dxx</a>]

34C37 Homoclinic and heteroclinic solutions

34C40 Equations and systems on manifolds

34C60 Qualitative investigation and simulation of models

34C99 None of the above, but in this section

34Dxx Stability theory [See also <a href="#code:37C75">37C75</a>, <a href="#code:93Dxx">93Dxx</a>]

34D08 Characteristic and Lyapunov exponents

34D30 Structural stability and analogous concepts [See also <a href="#code:37C20">37C20</a>]

34D35 Stability of manifolds of solutions

34D99 None of the above, but in this section

34E15 Singular perturbations, general theory

34E20 Singular perturbations, turning point theory, WKB methods