Results 21 to 30 of about 46 (46)

On odd powers of nonnegative polynomials that are not sums of squares

Forum of Mathematics, Sigma
We initiate a systematic study of nonnegative polynomials P such that $P^k$ is not a sum of squares for any odd $k\geq 1$ , calling such P stubborn. We develop a new invariant of a real isolated zero of a nonnegative polynomial in the plane,
Grigoriy Blekherman, Khazhgali Kozhasov, Bruce Reznick   +2 more
doaj   +1 more source

On Complex Matrix-Variate Dirichlet Averages and Its Applications in Various Sub-Domains. [PDF]

Entropy (Basel), 2023
Thankamani P, Sebastian N, Haubold HJ.
europepmc   +1 more source

Monotonicity of the number of positive entries in nonnegative matrix powers. [PDF]

J Inequal Appl, 2018
Xie Q.
europepmc   +1 more source

The higher rank numerical range of nonnegative matrices

Open Mathematics, 2013
Aretaki Aikaterini, Maroulas Ioannis
doaj   +1 more source

On a nonnegative irreducible matrix that is similar to a positive matrix

Open Mathematics, 2012
Loewy Raphael
doaj   +1 more source

Inertias and ranks of some Hermitian matrix functions with applications

Open Mathematics, 2012
Zhang Xiang, Wang Qing-Wen, Liu Xin
doaj   +1 more source

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Necessary and Sufficient Conditions for Rank-One-Generated Cones

Mathematics of Operations Research, 2023
C J argue, Fatma Kilinc-Karzan, Alex L Wang   +2 more
exaly  

Embeddability of real and positive operators

Linear and Multilinear Algebra, 2022
Tanja Eisner
exaly  

Optimizing and Factorizing the Wilson Matrix

American Mathematical Monthly, 2022
Nicholas J Higham, Matthew C Lettington
exaly  

Binary Component Decomposition Part I: The Positive-Semidefinite Case

SIAM Journal on Mathematics of Data Science, 2021
Richard Kueng, Joel A Tropp
exaly