The Global Embedding Problem of Semi-Riemannian into Einstein Manifolds
arXiv:math-ph/0407067
Abstract
We show that every analytic semi-Riemannian manifold can be isometrically embeddded into an Einstein maifold in co-dimension one.
There has been discovered a misconseption which does not allow the solvability of the algebraic systems arising in the proof without further topological assumptions on the manifold