Abstract
For a Hilbert space \({{\mathcal {H}}}\) and positive numbers p and q, let \(S_{p,q}({{\mathcal {H}}})\) stand for the class of those compact operators A on \({{\mathcal {H}}}\) such that \(\sum ^{\infty }_{j=1}s_{j}(A)^{p}|\log s_{j}(A)|^{q}<\infty \), where \(s_{j}(A)\) is the jth singular value of A counted from above with multiplicity. We characterize those weights M such that for any symbol \(a\in S(M;\Phi ,\Psi )\) the Weyl quantization of a belongs to \(S_{p,q}(L^{2})\).
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Communicated by L. Caffarelli.
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