A real n×n matrix A with all its eigenvalues λ satisfying|λ|>1 is called an anisotropic dilation.In this paper
the authors prove two equivalent characterizations of fractional integral commutators for anisotropic BMO function associated with dilation A;by using the series expansion of step quasi-norm and local orthonormal basis associated with dilation A
we obtain the anisotropic Fourier series expansion of localfunction.
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references
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