Whenever the coefficient matrix A is a Z-matrix, for a few of preconditioned methods, a sires of comparison theorems and Stein-Rosenberg type theorems of generalized block AOR, SSOR methods are proved, respectively.

• 当A为一般Z矩阵时，对多种预条件方法，给出了关于广义块AOR，SSOR迭代法的一系列比较定理及相应的Stein-Rosenberg型定理。