© 1997 by Institute of Mathematics and its Applications
Hankel operators of systems with feedthrough delays
Dipartimento di Matematica, Politecnico di Torino Corso Duca degli Abruzzi 24, 10129 Torino, Italy E-mail: lucipan{at}polito.it
We study the singular values of
and the essential spectrum of
*
when
is the (non compact) Hankel operator of a system with feedthrough delays.