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(→On a twodimensional rectangular grid: Added expression for b) 
(d and partials > Delta) 

==On a twodimensional rectangular grid==
Using the [[finite difference]] numerical method to discretize
the 2 dimensional Poisson equation (assuming a uniform spatial discretization, <math>\
:<math>
b =
\begin{bmatrix}









\end{bmatrix}.
</math>
