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From arXiv

A Spectral Equivalence for Jacobi Matrices

We use the classical results of Baxter and Gollinski-Ibragimov to prove a new spectral equivalence for Jacobi matrices on l2(N)l^2(\N). In particular, we consider the class of Jacobi matrices with conditionally summable parameter sequences and find necessary and sufficient conditions on the spectral measure such that k=nbk\sum_{k=n}^\infty b_k and k=n(ak21)\sum_{k=n}^\infty (a_k^2 - 1) lie in l12l1l^2_1 \cap l^1 or ls1l^1_s for s1s \geq 1.
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Updated on July 7, 2006
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