Discrete Poisson equation: Difference between revisions

</math>
 
For each <math> u_{ij} </math> equation, the columns of <math> D </math> correspond to thea block of <math> um </\math> components in <math> u </math>:
 
:<math>
</math>
 
while the columns of <math> I </math> to the left and right of <math> D </math> each correspond to theother blocks of <math> um </\math> components within <math> u </math>:
 
:<math>
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