REGULARIZATION AND ERROR ESTIMATES FOR NONHOMOGENEOUS BACKWARD HEAT PROBLEMS

In this article, we study the inverse time problem for the non- homogeneous heat equation which is a severely ill-posed problem. We regu- larize this problem using the quasi-reversibility method and then obtain error estimates on the approximate solutions. Solutions are calculated by the con- traction principle and shown in numerical experiments. We obtain also rates of convergence to the exact solution.