Spectral Nevanlinna-Pick and Caratheodory-Fejer problems for $n\geq3$ Nikolai NikolovPeter PflugPacal Thomas 30E0532F45spectral Nevanlinna-Pick and Caratheodory-Fejer problems The Nevanlinna-Pick problem and the simplest case of the Carath\'eodory-Fej\'er problem on the spectral ball $\Omega_3$ are reduced to interpolation problems on the symmetrized three-disc $\mathbb{G}_3$. Indiana University Mathematics Journal 2011 text pdf 10.1512/iumj.2011.60.4310 10.1512/iumj.2011.60.4310 en Indiana Univ. Math. J. 60 (2011) 883 - 894 state-of-the-art mathematics http://iumj.org/access/