tailieunhanh - Báo cáo hóa học: "WEIGHTED ESTIMATES FOR COMMUTATORS ON NONHOMOGENEOUS SPACES"

WEIGHTED ESTIMATES FOR COMMUTATORS ON NONHOMOGTuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: ENEOUS SPACES | WEIGHTED ESTIMATES FOR COMMUTATORS ON NONHOMOGENEOUS SPACES WENGU CHEN AND BING ZHAO Received 14 November 2005 Revised 8 March 2006 Accepted 11 March 2006 Let p be a Borel measure on Rd which may be nondoubling. The only condition that p must satisfy is p Q c0l Q n for any cube Q c Rd with sides parallel to the coordinate axes and for some fixed n with 0 n d. This paper is to establish the weighted norm inequality for commutators of Calderon-Zygmund operators with RBMO p functions by an estimate for a variant of the sharp maximal function in the context of the nonho-mogeneous spaces. Copyright 2006 W. Chen and B. Zhao. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction Let p be some nonnegative Borel measure on Rd satisfying p Q col Q n for any cube Q c Rd with sides parallel to the coordinate axes where l Q stands for the side length of Q and n is a fixed real number such that 0 n d. Throughout this paper all cubes we will consider will be those with sides parallel to the coordinate axes. For r 0 rQ will denote the cube with the same center as Q and with l rQ rl Q . Moreover Q x r will be the cube centered at x with side length r. The classical theory of harmonic analysis for maximal functions and singular integrals on Rd p has been developed under the assumption that the underlying measure p satisfies the doubling property that is there exists a constant c 0 such that p B x 2r cp B x r for every x e Rd and r 0. But recently many classical results have been proved still valid without the doubling condition see 1-18 and their references. Orobitg and Perez 11 have studied an analogue of the classical theory of Ap p weights in Rd without assuming that the underlying measure p is doubling. Then they Hindawi Publishing Corporation Journal ofInequalities and Applications Volume 2006 Article ID

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