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math.FA2011
The k-rank numerical radii
Aikaterini Aretaki, John Maroulas
The -rank numerical range is expressed via an intersection of a countable family of numerical ranges with respect to $n\times (n…
math.FA2009★ 2 cited
Investigating the Numerical Range of Non Square Matrices
Aikaterini Aretaki, John Maroulas
A presentation of numerical range for rectangular matrices is undertaken in this paper, introducing two different definitions and elaborating basic properties. Then we are extended…