EN
The commutator of a singular integral operator with homogeneous kernel Ω(x)/|x|ⁿ is studied, where Ω is homogeneous of degree zero and has mean value zero on the unit sphere. It is proved that $Ω ∈ L(log L)^{k+1}(S^{n-1})$ is a sufficient condition for the kth order commutator to be bounded on $L^{p}(ℝⁿ)$ for all 1 < p < ∞. The corresponding maximal operator is also considered.