2 papers
math.SP2005
A general realization theorem for matrix-valued Herglotz-Nevanlinna functions
Sergey Belyi, Seppo Hassi, Henk de Snoo +1
New special types of stationary conservative impedance and scattering systems, the so-called non-canonical systems, involving triplets of Hilbert spaces and projection operators, a…
math.SP2005
On realization of the Krein-Langer class Nk of matrix-valued functions in Hilbert spaces with indefinite metric
Yuri Arlinskii, Sergey Belyi, Vladimir Derkach +1
In this paper the realization problems for the Krein-Langer class of matrix-valued functions are being considered. We found the criterion when a given matrix-valued function…