Boundedness of the square function and rectifiability

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Abstract
Following a recent paper [X. Tolsa, Principal values for Riesz transforms and rectifiability, J. Funct. Anal. 254 (7) (2008) 1811–1863] we show that the finiteness of the square function associated with the Riesz transforms with respect to Hausdorff measure Hn (n is an integer) on a set E, implies that E is rectifiable.
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