Abstract
Mikhlin’s ideas and results related to the theory of spaces L p(·)ρ with nonstandard growth are developed. These spaces are called Lebesgue spaces with variable index; they are used in mechanics, the theory of differential equations, and variational problems. The boundedness of Fourier multipliers and singular operators on the spaces L p(·)ρ are considered. All theorems are derived from an extrapolation theorem due to Rubio de Francia. The considerations essentially use theorems on the boundedness of operators and maximal Hardy-Littlewood functions on Lebesgue spaces with constant index.
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Dedicated to the memory of Solomon Grigor’evich Mikhlin
Original Russian Text © V.M. Kokilashvili, S.G. Samko, 2008, published in Vestnik Sankt-Peterburgskogo Universiteta. Seriya 1. Matematika, Mekhanika, Astronomiya, 2008, No. 2, pp. 56–68.
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Kokilashvili, V.M., Samko, S.G. Singular operators and Fourier multipliers in weighted Lebesgue spaces with variable index. Vestnik St.Petersb. Univ.Math. 41, 134–144 (2008). https://doi.org/10.3103/S1063454108020076
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DOI: https://doi.org/10.3103/S1063454108020076