Spectral theory of Toeplitz and Hankel operators on the Bergman space .
Spectraloid operator polynomials, the approximate numerical range and an Eneström-Kakeya theorem in Hilbert space
We study a class of operator polynomials in Hilbert space which are spectraloid in the sense that spectral radius and numerical radius coincide. The focus is on the spectrum in the boundary of the numerical range. As an application, the Eneström-Kakeya-Hurwitz theorem on zeros of real polynomials is generalized to Hilbert space.
Spectre conjoint d'opérateurs pseudodifférentiels qui commutent
Spectres d'opérateurs et géométrie des Espaces de Banach [Book]
Spectrum of class operators.
Spectrum of generators of a noncommutative Banach algebra
Spectrum of infinite block matrices and -triangular operators.
Spectrum preserving linear mappings in Banach algebras
Let A and B be two unitary Banach algebras. We study linear mappings from A into B which preserve the polynomially convex hull of the spectrum. In particular, we give conditions under which such surjective linear mappings are Jordan morphisms.
Spektraltheorie stetiger Endomorphismen eines lokal-konvexen Raumes.
Stability and spectra of C0-semigroups.
Stability of operator semigroups: ideas and results
Stability on coupling SIR epidemic models with vaccination.
Stabilization of Schrödinger equation in exterior domains
We prove uniform local energy estimates of solutions to the damped Schrödinger equation in exterior domains under the hypothesis of the Exterior Geometric Control. These estimates are derived from the resolvent properties.
Standard Models of Abstract Intersection Theory for Operators in Hilbert Space
For an operator in a possibly infinite-dimensional Hilbert space of a certain class, we set down axioms of an abstract intersection theory, from which the Riemann hypothesis regarding the spectrum of that operator follows. In our previous paper (2011) we constructed a GNS (Gelfand-Naimark-Segal) model of abstract intersection theory. In this paper we propose another model, which we call a standard model of abstract intersection theory. We show that there is a standard model of abstract intersection...
Starke Konvergenz im verallgemeinerten Sinne und Spektra.
Stetigkeit des Spektrums einer Klasse nichtlinearer Operatoren II
Stetigkeit des Spektrums im Kleinen Einer Klasse Nichtlineare Operatoren I
Strong resonant tunneling, level repulsion and spectral type for one-dimensional adiabatic quasi-periodic Schrödinger operators
Structures of left n-invertible operators and their applications
We study left n-invertible operators introduced in two recent papers. We show how to construct a left n-inverse as a sum of a left inverse and a nilpotent operator. We provide refinements for results on products and tensor products of left n-invertible operators by Duggal and Müller (2013). Our study leads to improvements and different and often more direct proofs of results of Duggal and Müller (2013) and Sid Ahmed (2012). We make a conjecture about tensor products of left n-invertible operators...
Subspace gaps and Weyl's theorem for an elementary operator.