The maximal theorem for weighted grand Lebesgue spaces
Tom 188 / 2008
Studia Mathematica 188 (2008), 123-133
MSC: Primary 42B25; Secondary 46E30, 26D15.
DOI: 10.4064/sm188-2-2
Streszczenie
We study the Hardy inequality and derive the maximal theorem of Hardy and Littlewood in the context of grand Lebesgue spaces, considered when the underlying measure space is the interval $(0,1)\subset\mathbb R$, and the maximal function is localized in $(0,1)$. Moreover, we prove that the inequality $\| Mf\|_{p),w}\le c\| f\|_{p),w}$ holds with some $c$ independent of $f$ iff $w$ belongs to the well known Muckenhoupt class $A_p$, and therefore iff $\| Mf\|_{p,w}\le c\| f\|_{p,w}$ for some $c$ independent of $f$. Some results of similar type are discussed for the case of small Lebesgue spaces.
