Abstract
We survey some classical norm inequalities of Hardy, Kallman, Kato, Kolmogorov, Landau, Littlewood, and Rota of the type
and recall that under exceedingly stronger hypotheses on the operator A and/or the Banach space \({{\mathcal {X}}}\), the optimal constant C in these inequalities diminishes from 4 (e.g., when A is the generator of a \(C_0\) contraction semigroup on a Banach space \({{\mathcal {X}}}\)) all the way down to 1 (e.g., when A is a symmetric operator on a Hilbert space \({{\mathcal {H}}}\)). We also survey some results in connection with an extension of the Hardy–Littlewood inequality involving quadratic forms as initiated by Everitt.
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We are indebted to Man Kam Kwong and Lance Littlejohn for helpful discussions.
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Communicated by Seppo Hassi.
Dedicated with great pleasure to Henk de Snoo on the happy occasion of his 75th birthday.
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This article is part of the topical collection “Recent Developments in Operator Theory - Contributions in Honor of H.S.V. de Snoo” edited by Jussi Behrndt and Seppo Hassi.
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Gesztesy, F., Nichols, R. & Stanfill, J. A Survey of Some Norm Inequalities. Complex Anal. Oper. Theory 15, 23 (2021). https://doi.org/10.1007/s11785-020-01060-9
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DOI: https://doi.org/10.1007/s11785-020-01060-9