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Some remarks on the operator of Foias and Williams
Authors:Srdjan Petrovic
Affiliation:Department of Mathematics, Indiana University, Bloomington, Indiana 47405
Abstract:In this paper we study the Foias-Williams operator

begin{equation*}T(H_{g})=begin {pmatrix}S^{*} & H_{g} 0 & S end {pmatrix} end{equation*}

where $gin L^{infty }$, and $H_{g}$ is a Hankel operator with symbol $g$. We exhibit a relationship between the similarity of $T(H_{g})$ to a contraction and the rate of decay of ${|g_{n}|}_{n=0}^{infty }$, the absolute values of the Fourier coefficients of the symbol $g$.

Keywords:Polynomially bounded operators   similarity to contractions
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