</tr>
</table>
In the special case of a uniform grid with Δx = Δy = Δz, it can be shown that
<math> \psi(i,j,k) = \frac{1}{6} \big[ \psi(i+1,j,k) + \psi(i-1,j,k) + \psi(i,j+1,k) + \psi(i,j-1,k) + \psi(i,j,k+1) + \psi(i,j,k-1) \big] </math>
== 2D Quasi-Static Solution of TEM Transmission Line Structures ==