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This article is cited in 2 scientific papers (total in 2 papers)
Normal dilatation of triangular matrices
Kh. D. Ikramov M. V. Lomonosov Moscow State University
Abstract:
Let $R$ be a (real or complex) triangular matrix of order $n$, say, an upper triangular matrix. Is it true that there exists a normal $n\times n$ matrix $A$ whose upper triangle coincides with the upper triangle of $R$? The answer to this question is “yes” and is obvious in the following cases: (1) $R$ is real; (2) $R$ is a complex matrix with a real or a pure imaginary main diagonal, and moreover, all the diagonal entries of $R$ belong to a straight line. The answer is also in the affirmative (although it is not so obvious) for any matrix $R$ of order 2. However, even for $n=3$ this problem remains unsolved. In this paper it is shown that the answer is in the affirmative also for $3\times3$ matrices.
Received: 30.01.1995
Citation:
Kh. D. Ikramov, “Normal dilatation of triangular matrices”, Mat. Zametki, 60:6 (1996), 861–872; Math. Notes, 60:6 (1996), 649–657
Linking options:
https://www.mathnet.ru/eng/mzm1904https://doi.org/10.4213/mzm1904 https://www.mathnet.ru/eng/mzm/v60/i6/p861
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