利用球调和函数证明一类变量核奇异积分交换子[b,T]是Morrey空间Lp,α(Rn)(1<p<∞,0<α<n)上的紧算子,结果表明,在一定条件下,若存在p(1<p<∞),使得当交换子[b,T]是Morrey空间Lp,α(Rn)上的紧算子时,则b∈VMO(Rn).
Using spherical harmonic functions,we proved that a class of singular integral commutators with variable kernels [b,T]was compact operator on Morrey spaces L~(p,α)(R~n)for 1p ∞ and0αn.The results show that,under a certain condition,we obtain b∈ VMO(R~n)if the commutator[b,T]is compact operator on Morrey space L~(p,α)(R~n)for some 1p∞.