Loewner’s theorem for kernels having a finite number of negative squares

Author:

Alpay D.,Rovnyak J.

Abstract

By a theorem of Loewner, a continuously differentiable real-valued function on a real interval whose difference quotient is a nonnegative kernel is the restriction of a holomorphic function which has nonnegative imaginary part in the upper half-plane and is holomorphic across the interval. An analogous result is obtained when the difference-quotient kernel has a finite number of negative squares.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference15 articles.

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1. Notes on interpolation in the generalized Schur class. II. Nudel’man’s problem;Transactions of the American Mathematical Society;2002-10-09

2. Some Extensions of Loewner's Theory of Monotone Operator Functions;Journal of Functional Analysis;2002-02

3. On the Loewner problem in the class $\mathbf {N}_{\kappa }$;Proceedings of the American Mathematical Society;2001-12-31

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