On realization of the Kreĭn–Langer class Nκ of matrix-valued functions in Pontryagin spaces

On a class of extremal solutions of a mo

On a class of extremal solutions of a moment problem for rational matrix-valued functions in the nondegenerate case I

✍ Bernd Fritzsche; Bernd Kirstein; Andreas Lasarow 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 284 KB 👁 1 views

## Abstract The main theme of this paper is the discussion of a parametrized family of solutions of a finite moment problem for rational matrix‐valued functions in the nondegenerate case. We will show that each member of this family is extremal in several directions concerning some point of the ope