中图苔技术大荸数学系 University of Science and Technology of China DEPARTMENT OF MATHEMATICS 迭代矩阵 记A=D-L-U 0 D 0 0 0 0-a n-In 0 0 0数 学 系 University of Science and Technology of China DEPARTMENT OF MATHEMATICS • 迭代矩阵 记 A= D− L−U           = ann a D 0 11 0                  − − − = − 0 0 0 0 0 1 1 2 1 an an n a L                     − − − = − 0 0 0 0 0 1 1 2 1 n n n a a a U    