  In this work we obtain weighted $L^p$, $1<p<\infty$, and weak $L\log L$
estimates for the commutator of the Riesz transforms associated to a
Schr\"odinger operator $-\lap+V$, where $V$ satisfies some reverse H\"older
inequality. The classes of weights as well as the classes of symbols are larger
than $A_p$ and $BMO$ corresponding to the classical Riesz transforms.

Analysis of PDEs