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- W1925194265 abstract "Let A be an n × n (complex) matrix. Recall that the numericalrange W(A) of A is the set {Ax, x : x ∈ Cn, x = 1} in the plane, where·, · denotes the usual inner product in Cn. In this paper a series of tests isgiven, allowing one to determine when the numerical range of a 4 × 4 matrixA is an elliptic disc." @default.
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- W1925194265 date "2006-01-01" @default.
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- W1925194265 title "Elliptic numerical ranges of 4 × 4 matrices" @default.
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- W1925194265 doi "https://doi.org/10.11650/tjm.10.2006.872" @default.
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