On the numerical range of a bounded operator
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Publication:769821
DOI10.1307/mmj/1028997958zbMath0082.11601OpenAlexW2019667159MaRDI QIDQ769821
Publication date: 1958
Published in: Michigan Mathematical Journal (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1307/mmj/1028997958
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