Geodesic
Relations between weighted Orlicz and $BMO_\phi$ spaces through fractional integrals
Commentationes Mathematicae Universitatis Carolinae, Tome 40 (1999) no. 1, pp. 53-69

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We characterize the class of weights, invariant under dilations, for which a modified fractional integral operator $I_\alpha $ maps weak weighted Orlicz$-\phi $ spaces into appropriate weighted versions of the spaces $BMO_\psi $, where $\psi (t)=t^{\alpha /n}\phi ^{-1}(1/t)$. This generalizes known results about boundedness of $I_\alpha $ from weak $L^p$ into Lipschitz spaces for $p>n/\alpha $ and from weak $L^{n/\alpha }$ into $BMO$. It turns out that the class of weights corresponding to $I_\alpha $ acting on weak$-L_\phi $ for $\phi $ of lower type equal or greater than $n/\alpha $, is the same as the one solving the problem for weak$-L^p$ with $p$ the lower index of Orlicz-Maligranda of $\phi $, namely $\omega ^{p'}$ belongs to the $A_1$ class of Muckenhoupt.
Classification : 26A33, 42B25, 46E30, 47G10
Keywords: theory of weights; Orlicz spaces; $BMO$ spaces; fractional integrals 
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     author = {Harboure, E. and Salinas, O. and Viviani, B.},
     title = {Relations between weighted {Orlicz} and $BMO_\phi$ spaces through fractional integrals},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {53--69},
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     zbl = {1060.46509},
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Harboure, E.; Salinas, O.; Viviani, B. Relations between weighted Orlicz and $BMO_\phi$ spaces through fractional integrals. Commentationes Mathematicae Universitatis Carolinae, Tome 40 (1999) no. 1, pp. 53-69. http://geodesic.mathdoc.fr/item/CMUC_1999__40_1_a4/