ISRAEL JOURNAL OF MATHEMATICS, cilt.144, ss.151-155, 2004 (SCI-Expanded)
We investigate the Caucy problem for linear elliptic operators with C-infinity-coefficients at a regular domain Omega subset of R-n which is a classical example of an ill-posed problem. The Cauchy data are given at the manifold Gamma subset of partial derivative Omega and our goal is to obtain a stability estimate in H((4)) (Omega).