  This work is dedicated to the study of quasi-linear elliptic problems with
$L^1$ data, the simple model will be the next equation on $ (M,g) $ a compact
Riemannian manifold.
  $$-\Delta_{p} u=f$$
  Where $f\in L^{1}(M) $ .Our goal is to develop the functional framework and
tools that are necessary to prove the existence and the uniqueness of the
solution for the previous problem. Notice that our argument can be used to deal
with a more general class of quasi-linear equations.
