Another Remark on a Result of K. Goldberg
Canadian mathematical bulletin, Tome 6 (1963) no. 1, pp. 7-9
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In [3] K. Goldberg showed that if A is a 0-1 matrix that satisfies (1.1) then for some permutation matrix P, PAP* is a direct sum of matrices each of which is either zero or consists only of ones. More recently J. L. Brenner [1] proved that if A ∦ 0 (i.e. A has non-negative entries) and satisfies (1) then there exists a permutation matrix P such that PAP* = A1⊕ ... ⊕An in in which each Ai is either 0 or all positive, Ai > 0, and satisfies (1) as well.
Marcus, Marvin. Another Remark on a Result of K. Goldberg. Canadian mathematical bulletin, Tome 6 (1963) no. 1, pp. 7-9. doi: 10.4153/CMB-1963-002-6
@article{10_4153_CMB_1963_002_6,
author = {Marcus, Marvin},
title = {Another {Remark} on a {Result} of {K.} {Goldberg}},
journal = {Canadian mathematical bulletin},
pages = {7--9},
year = {1963},
volume = {6},
number = {1},
doi = {10.4153/CMB-1963-002-6},
url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1963-002-6/}
}
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