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Weighted modular inequalities for monotone functions. (English) Zbl 0946.26014
Summary: Weight characterizations of weighted modular inequalities for operators on the cone of monotone functions are given in terms of composition operators on arbitrary nonnegative functions with changes in weights. The results extend to modular inequalities, those corresponding to weighted Lebesgue spaces given by E. T. Sawyer [Stud. Math. 96, No. 2, 145-158 (1990; Zbl 0705.42014)]. Application to Hardy and fractional integral operators on monotone functions are given.

##### MSC:
 26D15 Inequalities for sums, series and integrals 42B25 Maximal functions, Littlewood-Paley theory 46E30 Spaces of measurable functions ($$L^p$$-spaces, Orlicz spaces, Köthe function spaces, Lorentz spaces, rearrangement invariant spaces, ideal spaces, etc.)
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