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Let $A$ be a Laplacian operator associated with a quadratic formon $Omega$ where $Omega$ is the Euclidean space $mathbb{R}^n$ ora domain of $mathbb{R}^n$. In this paper, we show that when afunction $bin BMO(Omega)$, the commutators $[b,igtriangledownA^{-1/2}]$ are bounded on $L^p(Omega)$ for all $1<p<2$, where theoperators $igtriangledown A^{-1/2}$ are Riesz transformsassociated with $A$. |
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Keywords:Riesz transform, commutators, BMO. |
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