THE PERTURBATION THEORY FOR THE DRAZIN INVERSE AND ITS APPLICATIONS
王国荣, 魏益民 · 高等学校计算数学学报：英文版 · 1996
Let A and E be an n×n matrices and B=A+E. Denote the Drazin inverse of A by AD In this paper, we give an upper bound for the relative error ||BD-AD||/||AD|| under certain circumstances. The error bound of the solution for singular equations Ax=b[Ind (A)=k,b∈R(Ak)] are also considered.