Uniqueness results for inverse Robin problems with bounded coefficient
  In this paper we address the uniqueness issue in the classical Robin inverse problem on a Lipschitz domain $\Omega\subset\RR^n$, with $L^\infty$ Robin coefficient, $L^2$ Neumann data and isotropic conductivity of class $W^{1,r}(\Omega)$, $r\textgreater{}n$. We show that uniqueness of the Robin coefficient on a subpart of the boundary given Cauchy data on the complementary part, does hold in dimension $n=2$ but needs not hold in higher dimension. We also raise on open issue on harmonic gradients which is of interest in this context. 
Laurent Baratchart (APICS), Laurent Bourgeois (ENSTA ParisTech INRIA   CNRS UMA POEMS), Juliette Leblond (APICS)
math.AP