15 citations · 20 across the 8 of their papers we have counts for
4 papers · 1 filter
A Toeplitz-like operator with rational symbol having poles on the unit circle I: Fredholm properties
G. J. Groenewald, S. ter Horst, J. Jaftha +1
In this paper a definition is given for an unbounded Toeplitz-like operator with rational symbol which has poles on the unit circle. It is shown that the operator is Fredholm if an…
Graphs with sparsity order at most two: The complex case
S. ter Horst, E. M. Klem
The sparsity order of a (simple undirected) graph is the highest possible rank (over or ) of the extremal elements in the matrix cone that consists of po…
The Bezout equation on the right half plane in a Wiener space setting
G. J. Groenewald, S. ter Horst, M. A. Kaashoek
This paper deals with the Bezout equation , , in the Wiener space of analytic matrix-valued functions on the right half plane. In particular, is an…
Interpolation in de Branges-Rovnyak spaces
Joseph A. Ball, Vladimir Bolotnikov, Sanne Ter Horst
A general interpolation problem with operator argument is studied for functions f from the de Branges-Rovnyak space H(s) associated with an analytic function s mapping the open uni…