The closure of the numerical range contains the spectrum
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Publication:2525892
DOI10.2140/pjm.1967.22.575zbMath0152.34602OpenAlexW2026937500MaRDI QIDQ2525892
Publication date: 1967
Published in: Pacific Journal of Mathematics (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.2140/pjm.1967.22.575
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