The numerical range of a pair of projections
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Publication:2552670
DOI10.1016/0022-1236(72)90037-7zbMath0237.47002OpenAlexW2052248914MaRDI QIDQ2552670
Publication date: 1972
Published in: Journal of Functional Analysis (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1016/0022-1236(72)90037-7
Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product) (46C05) Spectrum, resolvent (47A10)
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