TY  - JOUR
ID  - Aretaki2011
LB  - Aretaki2011
AU  - Aretaki, Aikaterini
AU  - Maroulas, John
TI  - Investigating the numerical range and q-numerical range of non square matrices
ST  - Investigating the numerical range and q-numerical range of non square matrices
JO  - Opuscula Math.
JA  - Opuscula Math.
JF  - Opuscula Mathematica
PY  - 2011
VL  - 31
IS  - 3
SP  - 303
EP  - 315
DO  - http://dx.doi.org/10.7494/OpMath.2011.31.3.303
UR  - http://dx.doi.org/10.7494/OpMath.2011.31.3.303
AB  - 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.
KW  - numerical range
KW  - projectors
KW  - matrix norms
KW  - singular values
SN  - 1232-9274
ER  -