Operators on Orlicz sequence spaces and ${\Delta }_2$-fundamentality

David E. Edmunds, Jan Krejčí, Zdeněk Mihula +1

A classical result states that the Hardy--Littlewood maximal operator is bounded on an Orlicz space $L^A({\mathbb{R}}^n)$ if and only if its conjugate Young function $\tilde{A}$ sati…