Let D denote the class of bounded simply connected real analytic plane doma
ins with the symmetry of an ellipse. We announce a proof that under generic
assumptions, if Omega(1), Omega(2) is an element of D and if the Dirichlet
spectra coincide, Spec(Omega(1)) = Spec(Omega(2)), then Omega(1) = Omega(2
) up to rigid motion.