2 papers
math.FA2006
A canonical decomposition for linear operators and linear relations
S. Hassi, Z. Sebestyén, H. S. V. de Snoo +1
An arbitrary linear relation (multivalued operator) acting from one Hilbert space to another Hilbert space is shown to be the sum of a closable operator and a singular relation who…
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…