%0 Journal Article %T Investigating the Numerical Range of Non Square Matrices %A Aikaterini Aretaki %A John Maroulas %J Mathematics %D 2009 %I arXiv %X 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 to the treatment of rank-k numerical range. %U http://arxiv.org/abs/0904.4325v1