Hyponormal \(2\times{}2\) matrices are subnormal
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Publication:1200550
DOI10.1016/0024-3795(92)90300-YzbMath0767.15016MaRDI QIDQ1200550
Arnold J. Insel, Stephen H. Friedberg
Publication date: 16 January 1993
Published in: Linear Algebra and its Applications (Search for Journal in Brave)
Norms of matrices, numerical range, applications of functional analysis to matrix theory (15A60) Hermitian, skew-Hermitian, and related matrices (15B57) Subnormal operators, hyponormal operators, etc. (47B20)
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Levels of subnormality ⋮ Characterizations of subnormal matrices ⋮ On normal matrices with normal principal submatrices ⋮ Convergence in measure with respect to a matrix-valued measure and some matrix completion problems ⋮ On normal extensions of submatrices ⋮ The separability problem and normal completions. ⋮ Hermitian and normal completions
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