Proving Existence of PDE Solution on H^(-1)(Ω)

[Feynman]

Hello,
How can i proof the existence of a solution of a PDE on H^(-1)( Omega)?

 

[Reb]

You mean (...must have meant) that, given the pde (P) \texttt{L}u=f on an appropriate space, the right hand side belongs to H^{-1}. The most appropriate space for the solutions is, in this case, L^{2}.

The reason for requiring f\in H^{-1} is that now the problem (P) can be put into variational formulation, and then the methods of functional analysis can be applied: Say, for linear problems, the Lax-Milgram Theorem. Or, for nonlinear parabolic problems, monotonicity methods.