H\"ormander's conditions for vector-valued kernels of singular integrals and its commutators
Abstract
In this paper we study Coifman type estimates and weighted norm inequalities for singular integral operators T and its commutators, given by the convolution with a vector valued kernel K. We define a weaker H\"ormander type condition associated with Young functions for the vector valued kernels. With this general framework we obtain as an example the result for the square operator and its commutator given in [ M. Lorente, M.S. Riveros, A. de la Torre On the Coifman type inequality for the oscillation of the one-sided averages , Journal of Mathematical Analysis and Applications, Vol 336, Issue 1,\ (2007) 577-592.]
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