In this paper we obtain a family of curves bounding the
region which contains all the non trivial Fucik eigenvalues of the
weighted one dimensional p laplacian with Neumann boundary
conditions. We obtain different proofs of the isolation result of
the trivial lines, and the existence of a gap at infinity between
the first curve and the trivial lines. We also give a lower bound
for the eigenvalues of the p-Laplacian with Neumann boundary
conditions.
