9 citations · 30 across the 18 of their papers we have counts for
18 papers
Convex invertible cones and Nevanlinna-Pick interpolation: The suboptimal case
Sanne ter Horst, Alma van der Merwe
Nevanlinna-Pick interpolation developed from a topic in classical complex analysis to a useful tool for solving various problems in control theory and electrical engineering. Over…
Linear matrix maps for which positivity and complete positivity coincide
Sanne ter Horst, Alma Naude
By the Choi matrix criteria it is easy to determine if a specific linear matrix map is completely positive, but to establish whether a linear matrix map is positive is much less st…
The convex invertible cone structure of positive real odd rational matrix functions
Sanne ter Horst, Alma Naudé
Positive real odd matrix functions, often referred to as positive real lossless matrix functions, play an important role in many applications in multi-port electrical systems. In t…
A Toeplitz-like operator with rational symbol having poles on the unit circle II: the spectrum
G. J. Groenewald, S. ter Horst, J. Jaftha +1
This paper is a continuation of our study of a class of Toeplitz-like operators with a rational symbol which has a pole on the unit circle. A description of the spectrum and its va…
The discrete twofold Ellis-Gohberg inverse problem
S. ter Horst, M. A. Kaashoek, F. van Schagen
In this paper a twofold inverse problem for orthogonal matrix functions in the Wiener class is considered. The scalar-valued version of this problem was solved by Ellis and Gohberg…
The twofold Ellis-Gohberg inverse problem in an abstract setting and applications
S. ter Horst, M. A. Kaashoek, F. van Schagen
In this paper we consider a twofold Ellis-Gohberg type inverse problem in an abstract *-algebraic setting. Under natural assumptions, necessary and sufficient conditions for the ex…