The $W$-weighted $m$-weak core inverse

Abstract

Recently, Malik and Ferreyra introduced the $m$-weak core inverse for complex square matrices which generalizes the core-EP inverse, the WC inverse, and therefore the core inverse. The main aim of this paper is to extend the concept of $m$-weak core inverse for complex rectangular matrices. This extension is called the $W$-weighted $m$-weak core inverse. We analyse its existence and uniqueness as solution of a system of matrix equations. We present various properties, representations and characterizations of the $W$-weighted $m$-weak core inverse, as well as its applications in solving certain matrix systems. A canonical form of the $W$-weighted $m$-weak core inverse is also provided by using a simultaneous unitary block upper triangularization of a pair of rectangular matrices.