Results 111 to 120 of about 244 (170)

Polynomial Numerical Hulls of Matrices

open access: yes, 2007
. For any n-by-n complex matrix A, we use the joint numerical range W(A,A 2,..., A k) to study the polynomial numerical hull of order k of A, denoted by V k (A). We give an analytic description of V 2 (A) when A is normal.
Chi-kwong Li, Ler Davis, Abbas Salemi
core  

An upper bound for the Z-spectral radius of adjacency tensors. [PDF]

open access: yesJ Inequal Appl, 2018
Wu ZY, He J, Liu YM, Tian JK.
europepmc   +1 more source

A Note On The Field Of Values Of Non-Normal Matrices

open access: yes, 2007
. It is shown that the distance from zero of the field of values of a matrix A depends on how large the departure from normality is compared to the distance from the zero of the field of values of the normal part of A.
Ilse C. F. Ipsen
core  

Sombor characteristic values of cographs. [PDF]

open access: yesHeliyon
Raza Z, Rather BA, Imran M.
europepmc   +1 more source

Streptococcus pneumoniae Serotypes Associated with Death, South Africa, 2012-2018. [PDF]

open access: yesEmerg Infect Dis, 2022
Müller A   +7 more
europepmc   +1 more source

Deciphering core phyllomicrobiome assemblage on rice genotypes grown in contrasting agroclimatic zones: implications for phyllomicrobiome engineering against blast disease. [PDF]

open access: yesEnviron Microbiome, 2022
Sahu KP   +10 more
europepmc   +1 more source

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