Table 4: The basic method is divergent (Theorem 3).

MatrixMethod Convergence interval

Si2SOR ( )1.0993(0, 0.8415)0.80.9974
Si2AOR ( , )1.0799(0, 2.7964)2.70.9942
Si2SSOR ( )1.24945(0, 2.0007)1.90.9909
Si2SAOR ( , )1.1380(0, 2.0949)20.9916
Si2Jacobi1.3233(0, 0.3705)0.70.9999
Si2Richardson40.3813(0, 0.0012)0.00110.9999