Improvements of preconditioned AOR iterative method for L-matrices

In this paper, we improve the preconditioned AOR method of linear systems considered by Evans et al. [The AOR iterative method for new preconditioned linear systems, Comput. Appl. Math. 132 (2001) 461–466]. In Evans’ paper, the coefficient matrix of linear system have to be an L  -matrix with ai,i+1ai+1,i>0ai,i+1ai+1,i>0, i=1,…,n-1i=1,…,n-1 and 0