%0 Journal Article
%T Investigating the numerical range and q-numerical range of non square matrices
%A Aikaterini Aretaki
%A John Maroulas
%J Opuscula Mathematica
%D 2011
%I AGH University of Science and Technology
%X A presentation of numerical ranges for rectangular matrices is undertaken in this paper, introducing two different definitions and elaborating basic properties. Further, we extend to the q-numerical range.
%K numerical range
%K projectors
%K matrix norms
%K singular values
%U http://www.opuscula.agh.edu.pl/vol31/3/art/opuscula_math_3121.pdf