Theory and Modern Applications
From: A fourth-order accurate difference Dirichlet problem for the approximate solution of Laplace’s equation with integral boundary condition
h
Discrete Fourier
Gauss–Seidel with reducing
Gauss–Seidel without reducing
1/16
0.19115
0.23565
0.71300
1/32
2.00135
3.97115
8.12375
1/64
26.6875
37.35625
90.72425
1/128
355.62775
580.22315
1798.54315