Abstract
In this article, we study necessary and sufficient conditions for the invertibility of a linear combination c 1 A k + c 2 B l , in the case when A and B are both commuting generalized or hypergeneralized projectors. We present some results relating different matrix partial orderings and the invertibility of a linear combination c 1 A k + c 2 B l when A and B are hypergeneralized projectors.
AMS Subject Classification:
Acknowledgements
Authors are supported by Grant No. 174007 of the Ministry of Science and Technological Development, Republic of Serbia.