Let be a singular nonintegral operator; that is, it does not have an integral representation by a kernel with size estimates, even rough. In this paper, we consider the boundedness of commutators with and Lipschitz functions. Applications include spectral multipliers of self-adjoint, positive operators, Riesz transforms of second-order divergence form operators, and fractional power of elliptic operators.
"Commutators with Lipschitz Functions and Nonintegral Operators." J. Appl. Math. 2013 1 - 8, 2013. https://doi.org/10.1155/2013/178961