the National Natural Sciences Foundation of China(10371044);the Science and Technology Commission of Shanghai Municipality through Grant(04JC14031);the University Young Teacher Sciences Foundation of Anhui Province(2006jq1220zd);Supported by the Ph.D.,Program Scholarship Fund of ECNU(2007)
In this paper, the authors discuss the relationship in detail between the rank of M in the modified matrix M = A + BC^* and the rank of matrix A. The authors do believe the results are useful tools in the modified m...