Dear all,

i'm solving a problem with nonlinear poisson equation. But i have found on the 
website 2 explanations about that equation, but this both don't match with each 
other.
Here a general nonlinear equation was discussed:
http://fenicsproject.org/documentation/tutorial/nonlinear.html

Using the equation Nr. 9 of the tutorial for the other specific equation here:
http://fenicsproject.org/documentation/dolfin/dev/python/demo/documented/nonlinear-poisson/python/documentation.html
 

cozuld 

i could not come up to the derivative of F'(uh;δu,v). 

Could someone explain me, how can i fit the derivative from the tutorial to the 
derivative from the specific equation of nonlinear-poisson.
I would be really happy with any explanation!!

Best
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