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Published online by Cambridge University Press: 01 January 1998
Let A1,…, An be Lipschitz functions on R such that A′1,…,A′n∈VMO. We show that on any bounded interval, the Calderón commutator associated with the kernel (A1(x)−A1(y))…(An(x)−An(y))/(x−y)n+1 is a compact perturbation of −πiHMA′1…A′n, where H is the Hilbert transform.