2 papers
math.FA2024
Real-valued spectral shift functions for contractions and dissipative operators
Mark M. Malamud, H. Neidhardt, Vladimir V. Peller
In recent joint papers the authors of this note solved a famous problem remained open for many years and proved that for arbitrary contractions with trace class difference there ex…
math-ph2007
Linear non-autonomous Cauchy problems and evolution semigroups
Hagen Neidhardt, Valentin A. Zagrebnov
The paper is devoted to the problem of existence of propagators for an abstract linear non-autonomous evolution Cauchy problem of hyperbolic type in separable Banach spaces. The pr…