Learn More
  • Kezheng Zuo
  • Wuhan University Journal of Natural Sciences
  • 2010
The paper researches the rank of combinations a PA + b AQ-c PAQ of two idempotent matrices P and Q. Using the properties of the idempotent matrix and elementary block matrix operation, we get some rank equalities for combinations a PA + b AQ-c PAQ of two idempotent matrices P and Q. These rank equalities generalize the results of Koliha J J, Rakočević V and(More)
In this paper, some conditions for the nonsingularity and group inverses of linear combinations of generalized and hypergeneralized projectors are established. Moreover, some formulae for the inverses and group inverses of them are derived. The work of this paper extends some previous results.
  • 1