给出一些易于检验的MPSD 迭代法的敛散性定理. 利用这些定理,能较容易地判别解线性方程组Ax = c 的MPSD 迭代法的敛散性.-Give some easy to test MPSD iterative method of Convergence and Divergence theorem. Use of these theorems, can more easily identify solutions of linear equations Ax = c of the MPSD