From the 1 of 12 linked papers with an AI index.
8 papers · 1 filter
Generalized Foguel-Hankel Operators
Nikolaos Chalmoukis, Giovanni Marano
The paper defines a broader class of Foguel‑Hankel operators by replacing the unilateral shift with a general multiplication operator on the Hardy space, studies when these operato…
Uncentred maximal operators with respect to half balls on Damek--Ricci spaces
Nikolaos Chalmoukis, Stefano Meda, Effie Papageorgiou +1
In this paper we study a variant of the uncentred Hardy--Littlewood maximal operator on Damek--Ricci spaces in which balls are replaced by suitable half balls. Perhaps surprisingly…
Operators with small Kreiss constants
Nikolaos Chalmoukis, Georgios Tsikalas, Dmitry Yakubovich
We investigate matrices satisfying the Kreiss condition with lying arbitrarily close to We provide lower bo…
Maximal subspaces of strong continuity for composition semigroups
Nikolaos Chalmoukis, Ãlvaro Miguel Moreno
Let a semigroup of holomorphic self-maps of the unit disk and the semigroup of composition operators which corresponds to Given…
Quaternionic Carleson measures
Nikolaos Chalmoukis, Giulia Sarfatti
In this paper we provide a general construction of a quaternionic Banach space of slice regular functions from a given Banach space of holomorphic functions, which we call its quat…
Simply interpolating and Carleson sequences for Hardy spaces in the polydisc
Nikolaos Chalmoukis, Alberto Dayan
We study the relation between simply and universally interpolating sequences for the holomorphic Hardy spaces on the polydisc. In dimension a sequence is…