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Numerical radius and zero pattern of matrices

open access: yes, 2007
Let A be an n×n complex matrix and r be the maximum size of its principal submatrices with no off-diagonal zero entries. Suppose A has zero main diagonal and x is a unit n-vector.
Vladimir Nikiforov
core  

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

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