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Something was computed 
At (0,0,0), we have 0.165358 and the Laplacian is -1
Now I'll compute the derivative of u at some points
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At (1/2,1/2,1/2), u = -2.59553e-17 and the gradient is: -0.267016, -0.267016, -0.267016
which has norm 0.462486
But a more accurate approximation should be 0.479895
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At (1,1/2,0), u =-2.99539e-17 and the gradient is: 0, -0.360416, 0
which has norm 0.360416
A better approximation of u_\nu should be 0.385416
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I hope this was useful.
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