> I'm interested in using the Sacado package in Trilinos to numerically
> evaluate the global Newton matrix for a problem in which I have have
> hanging nodes handled via standard hanging-node constraints (i.e strongly).

I don't know. I think what it takes the most is for someone to really think in 
detail about 
- what the ConstraintMatrix::condense() function does on vectors
- how this interacts with automatic differentiation
I think you could probably write all this down explicitly on a piece of paper 
for two cells, one of which is refined.

I am not completely sure anything needs to be done at all, but I can't say I 
really thought about it in sufficient detail.

Best
 W.

-- 
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Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/

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