35Fxx General firstorder equations and systems
 35F05 Linear firstorder equations
 35F10 Initial value problems for linear firstorder equations
 35F15 Boundary value problems for linear firstorder equations
 35F16 Initialboundary value problems for linear firstorder equations

35F20 Nonlinear firstorder equations
(1)
 35F21 HamiltonJacobi equations
 35F25 Initial value problems for nonlinear firstorder equations
 35F30 Boundary value problems for nonlinear firstorder equations
 35F31 Initialboundary value problems for nonlinear firstorder equations
 35F35 Linear firstorder systems
 35F40 Initial value problems for linear firstorder systems
 35F45 Boundary value problems for linear firstorder systems
 35F46 Initialboundary value problems for linear firstorder systems
 35F50 Nonlinear firstorder systems
 35F55 Initial value problems for nonlinear firstorder systems
 35F60 Boundary value problems for nonlinear firstorder systems
 35F61 Initialboundary value problems for nonlinear firstorder systems
 35F99 None of the above, but in this section