35Qxx Equations of mathematical physics and other areas of

35Q05  Euler-Poisson-Darboux equation and generalizations
35Q15  Riemann-Hilbert problems, See also {30E25, 31A25, 31B20}
35Q30  Stokes and Navier-Stokes equations, See also {76D05, 76D07,
               76N10}
35Q35  Other equations arising in fluid mechanics
35Q40  Equations from quantum mechanics
35Q51  Solitons, See also {58F07}
35Q53  KdV-like equations (Korteweg-de Vries, Burgers,
               sine-Gordon, sinh-Gordon, etc.), See also {58F07}
35Q55  NLS-like (nonlinear Schrodinger) equations, See Also {
               58F07}
35Q58  Other completely integrable equations, See also {58F07}
35Q60  Equations of electromagnetic theory and optics
35Q72  Other equations from mechanics
35Q75  PDE in relativity
35Q80  Applications of PDE in areas other than physics
35Q99  None of the above but in this section