35Gxx General higherorder equations and systems
 35G05 Linear higherorder equations
 35G10 Initial value problems for linear higherorder equations

35G15 Boundary value problems for linear higherorder equations
(1)
 35G16 Initialboundary value problems for linear higherorder equations
 35G20 Nonlinear higherorder equations
 35G25 Initial value problems for nonlinear higherorder equations
 35G30 Boundary value problems for nonlinear higherorder equations
 35G31 Initialboundary value problems for nonlinear higherorder equations
 35G35 Linear higherorder systems
 35G40 Initial value problems for linear higherorder systems
 35G45 Boundary value problems for linear higherorder systems
 35G46 Initialboundary value problems for linear higherorder systems
 35G50 Nonlinear higherorder systems
 35G55 Initial value problems for nonlinear higherorder systems
 35G60 Boundary value problems for nonlinear higherorder systems
 35G61 Initialboundary value problems for nonlinear higherorder systems
 35G99 None of the above, but in this section