This thesis contains three topics in the iterative method for linear systems.They are respectively: Block AOR iterative method for rank deficient least squares problems;

• 在这篇学位论文中，我们考虑了三个与求解线性方程组相关的问题，它们分别是： 求解亏秩最小二乘问题的块加速超松弛迭代法；