Small Divisor problems and $A_p$ weights with an application

Abstract

We establish a link between Muckenhoupt $A_p$ weights and a means to address small divisor problems. We use this link to obtain a quantitative version of the Ehrenpreis-Malgrange theorem of local solvability for constant coefficient PDE. We give an example as to how our theorem applies. In our quantitative version of the Ehrenpreis-Malgrange theorem, the loss of derivatives in the solvability estimate is measured in the scale of Sobolev spaces via the use of Muckenhoupt A_p weights. A part of our results are global in nature.

This is the accepted version of the paper incorporating various revisions suggested by the referee. The paper will appear in a special volume for Bernard Helffer in Pure and Applied Functional Analysis(PAFA)