New results regarding the Sobolev regularity of the principal solution of the linear Beltrami equation $\bar{ \partial} f = \mu \partial f + \nu \overline{ \partial f}$ for discontinuous Beltrami coefficients $\mu$ and $\nu$ are obtained, using Kato-Ponce commutators, obtaining that $\overline \partial f$ belongs to a Sobolev space with the same smoothness as the coefficients but some loss in the integrability parameter. A conjecture on the cases where the limitations of the method do not work is raised.
Categories: math.AP math.CA