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 $N_{\kappa }$ of matrix-valued functions are being considered. We found the criterion when a given matrix-valued function…