Notes on power LCM matrices
Shaofang Hong (2004)
Acta Arithmetica
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Displaying similar documents to “A non graph theory approach to Ulam's conjecture”
Notes on power LCM matrices
Upper bounds for the best normal approximation.
László, Lajos (1998)
Mathematica Pannonica
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The Dittert's function on a set of nonnegative matrices.
Hwang, Suk Geun, Sohn, Mun-Go, Kim, Si-Ju (1990)
International Journal of Mathematics and Mathematical Sciences
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A counterexample to the Drury permanent conjecture
George Hutchinson (2017)
Special Matrices
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We offer a counterexample to a conjecture concerning the permanent of positive semidefinite matrices. The counterexample is a 4 × 4 complex correlation matrix.
Thin Lehman matrices and their graphs.
Wang, Jonathan (2010)
The Electronic Journal of Combinatorics [electronic only]
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On a generalization of the Van Der Waerden conjecture
Sasser, D.W., Slater, M.L. (1969)
Portugaliae mathematica
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Star matrices: properties and conjectures.
Arulraj, Soosai Maria, Somasundaram, Kanagasabapathi (2007)
Applied Mathematics E-Notes [electronic only]
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On powers of non-negative matrices
Antonín Vrba (1973)
Časopis pro pěstování matematiky
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Decreasing diagonal elements in completely positive matrices
Francesco Barioli (1998)
Rendiconti del Seminario Matematico della Università di Padova
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On a nonnegative irreducible matrix that is similar to a positive matrix
Raphael Loewy (2012)
Open Mathematics
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Let A be an n×n irreducible nonnegative (elementwise) matrix. Borobia and Moro raised the following question: Suppose that every diagonal of A contains a positive entry. Is A similar to a positive matrix? We give an affirmative answer in the case n = 4.