Discrete Poisson equation: Difference between revisions

(short desc)
\vec{b} =
\left[\begin{array}{l}
-\Delta x^2 (g_{22} + u_{12} + u_{21}) \\
-\Delta x^2 g_{32} + u_{31} ~~~~~~~~ \\
-\Delta x^2 g_{42} + u_{52} + u_{41} \\
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