The two-point spectral Nevanlinna-Pick problem

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A model theory for Γ-contractions (2003, background): “Proof. The equivalence of (i) to (v) is contained in Theorem 1.5 of [4] while the equivalence of (i) and (vi) is given in Theorem 1.5 of [ 5 ].”
A Schwarz lemma for a domain related to μ-synthesis (2007, methodology): “A solution for the special case of the spectral Nevanlinna-Pick problem (that is, with μE being the spectral radius) for 2 × 2 matrix functions and 2 interpolation points follows from the theory [2, 3] of the symmetrised bidisc.”
The two-by-two spectral Nevanlinna-Pick problem (2003, background): “We have investigated the operator theory, function theory and geometry of this set in several papers (see references in [2, 3]), but the present paper is self-contained.”
The hyperbolic geometry of the symmetrized bidisc (2004, background): “However, in this article we focus on the intrinsic complex geometry of G. We shall solve the Caratheodory and Kobayashi extremal problems on G. This immediately yields a full solution of the spectral Nevanlinna-Pick problem in the case of two interpolation points and two-by-two matrices; see [ 5 ] f”