35Bxx Qualitative properties of solutions

35B05  General behavior of solutions of PDE (comparison theorems;
               oscillation, zeros and growth of solutions; mean value
               theorems)
35B10  Periodic solutions
35B15  Almost periodic solutions
35B20  Perturbations
35B25  Singular perturbations
35B27  Homogenization; partial differential equations in media
               with periodic structure, See also {73B27, 76D30}
35B30  Dependence of solutions of PDE on initial and boundary
               data, parameters, See also {58F14}
35B32  Bifurcation, See also {58F14}
35B35  Stability, boundedness
35B37  PDE in connection with control problems, See also {49J20,
               49K20, 93C20}
35B40  Asymptotic behavior of solutions
35B45  A priori estimates
35B50  Maximum principles
35B60  Continuation and prolongation of solutions of PDE, See
               also {58A15, 58A17, 58Hxx}
35B65  Smoothness/regularity of solutions of PDE
35B99  None of the above but in this section