Stability of three-layer difference scheme

The stability of a three-layer difference scheme with two weights approximating the ill-posed Cauchy problem for second order differential equation with an unbounded, both above and below the self-adjoint operator in the main part are considered. Based on the factorization method and application variants weight difference of a priori estimates of Carleman type conditions unconditional stability of the scheme has been obtained. Application of the above theorem to construct unconditionally stable difference schemes for the one-dimensional coefficient inverse problem of determining the potential in the Schrodinger equation is considered.