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Let μ be a positive Borel measure on the interval(0,1).The Hankel matrix Hμ=(μn,k)n,k≥0 with entries μn,k=μn+k,where μn=f[0,1)tndμ(t),induces formally the operator as■,where■ is an analytic function in D.We characterize the positive Borel measures on [0,1) such that DHμ(f)(z)=∫[0,1),f(t)/((1-tz)2)dμ(t) for all f in the Hardy spaces Hp(0
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