Kawtar Attas

activity

20152019

k

-spectrally monomorphic Hermitian matrices

1 citations · 1 across the 2 of their papers we have counts for

collaborators

3 papers

math.CO2019★ 1 cited

Characterization of $k$ -spectrally monomorphic Hermitian matrices

Kawtar Attas, Abderrahim Boussaïri, Imane Souktani

This paper solves the following problem about Hermitian matrices related to the theory of $2$ -structures:\emph{ }Let $n$ be a positive integer and $k$ be an integer with $k\in \{3,…

math.CO2016

Skew-signings of positive weighted digraphs

Kawtar Attas, Abderrahim Boussaïri, Mohamed Zaidi

An arc-weighted digraph is a pair $(D, ω)$ where $D$ is a digraph and $ω$ is an \emph{arc-weight function} that assigns\ to each arc $uv$ of $D$ a nonzero real number $ω (uv)$ . Given…

math.CO2015

About the spectra of a real nonnegative matrix and its signings

Kawtar Attas, Abderrahim Boussaïri, Mohamed Zaidi

For a real matrix $M$ , we denote by $s p (M)$ the spectrum of $M$ and by $∣ M ∣$ its absolute value, that is the matrix obtained from $M$ by replacing each entry…

Characterization of k-spectrally monomorphic Hermitian matrices

Skew-signings of positive weighted digraphs

About the spectra of a real nonnegative matrix and its signings

Characterization of $k$ -spectrally monomorphic Hermitian matrices