On the Closure of the Numerical Range of an Operator
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Publication:5561435
DOI10.2307/2035486zbMath0173.42104OpenAlexW4245577866MaRDI QIDQ5561435
G. H. Orland, Sterling K. Berberian
Publication date: 1967
Full work available at URL: https://doi.org/10.2307/2035486
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