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L2 regularity of measurable solutions of a finite-difference equation of the circle

By Michael R. Herman

Abstract

We show that if $\varphi$ is a lacunary Fourier series and the equation $\psi (x) -\psi (x + \alpha) = \varphi(x), x \bmod 1$ has a measurable solution $\varphi$, then in fact the equation has a solution in L2.\ud \ud This work of Michel Herman (1942-2000) appeared only as a preprint of the Mathematics Institute, University of Warwick, dated May 1976. It was turned into TEX format by Claire Desescures. Minor editorial work was done by Albert Fathi

Topics: QA
Publisher: Cambridge University Press
Year: 2004
OAI identifier: oai:wrap.warwick.ac.uk:753

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Citations

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