Bifurcation problems Capillarity (surface tension) [See also 76B45] Differential equations, Partial 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] Mecánica de fluidos 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 Wave equation