Abstract
Let \(p(\cdot ):\mathbb {R}\rightarrow (1,\infty )\) be a sufficiently regular variable exponent and \(\varrho\) be a Khvedelidze weight on \(\mathbb {R}\). Suppose that a function a belongs to the algebra \(PC_{p(\cdot ),\varrho }\) of piecewise continuous Fourier multipliers on the weighted variable Lebesgue space \(L^{p(\cdot )}(\mathbb {R},\varrho )\). We show that the Fourier convolution operator \(W^0(a)=F^{-1}aF\) is invertible on the space \(L^{p(\cdot )}(\mathbb {R},\varrho )\) if and only if its symbol a is invertible in \(L^\infty (\mathbb {R})\).
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Acknowledgements
We would like to thank the anonymous referees for useful remarks improving the presentation.
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This work was supported by national funds through the FCT - Fundação para a Ciência e a Tecnologia, I.P. (Portuguese Foundation for Science and Technology) within the scope of the project UIDB/00297/2020 (Centro de Matemática e Aplicações).
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Dedicated to Professor Stefan Samko on the occasion of his 80th birthday.
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Fernandes, C., Karlovych, O. & Medalha, S. INVERTIBILITY OF FOURIER CONVOLUTION OPERATORS WITH PC SYMBOLS ON VARIABLE LEBESGUE SPACES WITH KHVEDELIDZE WEIGHTS. J Math Sci 266, 419–434 (2022). https://doi.org/10.1007/s10958-022-05897-7
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DOI: https://doi.org/10.1007/s10958-022-05897-7
Keywords
- Variable Lebesgue space
- Khvedelidze weight
- Fourier convolution operator
- Fourier multiplier
- Piecewise continuous function
- Invertibility