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curved elements


What is the status of curved (e.g., isoparametric) elements in dolfin?
I gather they are not implemented in the main branch.   Has anyone
done anything with this can be used?  Is there any example code?
(For example, if you want to
solve the Poisson problem in a disc and get better than 2nd order
convergence, you need to do better than polygonal approximation of
the disc.)

 -- Doug

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