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math.FA2026
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…
math.FA2026
Maximal subspaces of strong continuity for composition semigroups
Nikolaos Chalmoukis, Álvaro Miguel Moreno
Let a semigroup of holomorphic self-maps of the unit disk and the semigroup of composition operators which corresponds to Given a…
math.FA2026
Generalized Foguel-Hankel Operators
Nikolaos Chalmoukis, Giovanni Marano
In this paper we introduce a more general class of Foguel-Hankel operators, where the unilateral shift on is replaced by a general multiplication operator on…