Applications of Mathematics Approximation theory Approximations and Expansions Bifurcation problems Capillarity (surface tension) [See also 76B45] Differential Equations Differential equations Differential equations, Partial Dynamical Systems Dynamical systems Dynamical systems and ergodic theory [See also 26A18, 28Dxx, 34Cxx, 34Dxx, 35Bxx, 46Lxx, 58Jxx, 70-XX] Ecuaciones de onda Ecuaciones diferenciales Équations aux dérivées partielles Équations d'onde Fluid mechanics {For general continuum mechanics, see 74Axx, or other parts of 74-XX} Incompressible inviscid fluids Incompressible viscous fluids Infinite-dimensional Hamiltonian systems [See also 35Axx, 35Qxx] Mathematical Methods in Physics Mathematical physics Mathematics Mecánica de fluidos Number Theory Number theory Partial differential equations Perturbations, KAM for inf Pseudodifferential operators Pseudodifferential operators and other generalizations of partial differential operators [See also 47G30, 58J40] Water waves, gravity waves; dispersion and scattering, nonlinear interaction