35XX 


Partial differential equations 

35Fxx 

General firstorder equations and systems 


35F05 
General theory of linear firstorder PDE 


35F10 
Initial value problems for linear firstorder PDE, linear evolution equations 


35F15 
Boundary value problems for linear firstorder PDE 


35F20 
General theory of nonlinear firstorder PDE 


35F25 
Initial value problems for nonlinear firstorder PDE, nonlinear evolution equations 


35F30 
Boundary value problems for nonlinear firstorder PDE 


35F99 
None of the above, but in this section 