Discrete Poisson equation: Difference between revisions

(→‎On a two-dimensional rectangular grid: In the fourth row, changed some vdots to ddots. I think they make more sense here.)
-1 & ~4 & -1 & ~0 & ~0 & \ldots & ~0 \\
~0 & -1 & ~4 & -1 & ~0 & \ldots & ~0 \\
\vdots & \vdotsddots & \vdotsddots & \vdotsddots & \vdotsddots & \ddots & \vdots \\
~0 & \ldots & ~0 & -1 & ~4 & -1 & ~0 \\
~0 & \ldots & \ldots & ~0 & -1 & ~4 & -1 \\
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