AbstractWe show that there exist non-compact composition operators in the connected component of the compact ones on the classical Hardy space H2. This answers a question posed by Shapiro and Sundberg in 1990. We also establish an improved version of a theorem of MacCluer, giving a lower bound for the essential norm of a difference of composition operators in terms of the angular derivatives of their symbols. As a main tool we use Aleksandrov–Clark measures
We obtain a representation for the norm of certain compact weighted composition operator Cψ,ϕ on the...
Abstract. We consider composition operators on Hardy spaces of a half-plane. We mainly study bounded...
AbstractLet φ and ψ be analytic self-maps of the unit disc, and denote by Cφ and Cψ the induced comp...
We study when multiplication by a weight can turn a non-compact composition operator on H 2 into a c...
We study when multiplication by a weight can turn a non-compact composition operator on H 2 into a c...
The aim of this paper is to study when two composition operators on the Hilbert space of Dirichlet s...
We characterise composition operators between Hardy spaces. Certain growth conditions for generalize...
We study when multiplication by a weight can turn a non-compact composition operator on \(H^2\) into...
The aim of this paper is to study when two composition operators on the Hilbert space of Dirichlet s...
AbstractWe determine when two linear-fractional composition operators on the Hardy space H2 belong t...
We investigate compactness of composition operators on the Hardy space of Dirichlet series induced b...
We consider, for G a simply connected domain and 0 < p < (G) formed by fixing a Riemann m...
AbstractWe compare the compactness of composition operators on H2 and on Orlicz–Hardy spaces HΨ. We ...
Abstract. We give examples of results on composition operators connected with lens maps. The first t...
AbstractA characterization of compact difference is given for composition operators acting on the st...
We obtain a representation for the norm of certain compact weighted composition operator Cψ,ϕ on the...
Abstract. We consider composition operators on Hardy spaces of a half-plane. We mainly study bounded...
AbstractLet φ and ψ be analytic self-maps of the unit disc, and denote by Cφ and Cψ the induced comp...
We study when multiplication by a weight can turn a non-compact composition operator on H 2 into a c...
We study when multiplication by a weight can turn a non-compact composition operator on H 2 into a c...
The aim of this paper is to study when two composition operators on the Hilbert space of Dirichlet s...
We characterise composition operators between Hardy spaces. Certain growth conditions for generalize...
We study when multiplication by a weight can turn a non-compact composition operator on \(H^2\) into...
The aim of this paper is to study when two composition operators on the Hilbert space of Dirichlet s...
AbstractWe determine when two linear-fractional composition operators on the Hardy space H2 belong t...
We investigate compactness of composition operators on the Hardy space of Dirichlet series induced b...
We consider, for G a simply connected domain and 0 < p < (G) formed by fixing a Riemann m...
AbstractWe compare the compactness of composition operators on H2 and on Orlicz–Hardy spaces HΨ. We ...
Abstract. We give examples of results on composition operators connected with lens maps. The first t...
AbstractA characterization of compact difference is given for composition operators acting on the st...
We obtain a representation for the norm of certain compact weighted composition operator Cψ,ϕ on the...
Abstract. We consider composition operators on Hardy spaces of a half-plane. We mainly study bounded...
AbstractLet φ and ψ be analytic self-maps of the unit disc, and denote by Cφ and Cψ the induced comp...