Marinus A. Kaashoek

Peter Lancaster

Seymour Goldberg

In this article we shall use two special classes of reproducing kernel Hilbert spaces (which originate in the work of de Branges [dB) and de Branges-Rovnyak [dBRl), respectively) to solve matrix versions of a number of classical interpolation problems. Enroute we shall reinterpret de Branges' characterization of the first of these spaces, when it is finite dimensional, in terms of matrix equations of the Liapunov and Stein type and shall subsequently draw some general conclusions on rational m x m matrix valued functions which are "J unitary" a.e. on either the circle or the line. We shall also make some connections with the notation of displacement rank which has been introduced and extensively studied by Kailath and a number of his colleagues as well as the one used by Heinig and Rost [HR). The first of the two classes of spaces alluded to above is distinguished by a reproducing kernel of the special form K (>.) = J - U(>')JU(w)* (Ll) w Pw(>') , in which J is a constant m x m signature matrix and U is an m x m J inner matrix valued function over ~+, where ~+ is equal to either the open unit disc ID or the open upper half plane (1)+ and Pw(>') is defined in the table below.

Volume II: Topics in Analysis and Operator Theory

The Gohberg Anniversary Collection

Miron Tismenetsky

Department of Mathematics and Statistics Peter Lancaster

Matrix algebra; Determinants, inverse matrices, and rank; Linear, euclidean, and unitary spaces; Linear transformations and matrices; Linear transformations in unitary spaces and simple matrices; The jordan canonical form: a geometric approach; Matrix polynomials and normal forms; The variational method; Functions of matrices; Norms and bounds for eigenvalues; Perturbation theory; Linear matrices equations and generalized inverses; Stability problems; Matrix polynomials; Nonnegative matrices.

With Applications

The Theory of Matrices

Albrecht Böttcher

This book is based on lectures presented at a meeting on operator theory and its applications held at the Fields Insitute in 1994.

Lectures on Operator Theory and Its Applications

A chronological essay on the ninth chapter of Daniel: or, an interpretation of the prophecy of the Seventy Weeks, etc

A chronological essay, on the ninth chapter of the book of Daniel: or, An interpretation, of the prophecy of the seventy weeks

Peter Lancaster

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