Philip,

> I was able to go through the paper from Jean-Paul more thoroughly a few 
> times. I do have a few questions regarding the paper.

So many questions :-)

Most of your questions -- like why the stress-strain tensor in 
elasticity has four indices, and whether or not to use mixed elements -- 
are well answered in the literature. For the former, take a book about 
solid mechanics. For the latter take a good book about the theory of 
finite elements, but I think I also discuss this in one of the lectures 
about how to choose the element for a given equation.

I, or J-P, or others could easily answer all of your questions here. But 
my impression is that you are lacking some foundational knowledge about 
common PDEs and their finite element discretization. Every answer we 
will give you will raise more questions. The only way to get ahead of 
this curve is to read.

Of course, if you have questions *specific to deal.II*, then we're more 
than happy to answer them!

Best
  Wolfgang

-- 
------------------------------------------------------------------------
Wolfgang Bangerth          email:                 bange...@colostate.edu
                            www: http://www.math.colostate.edu/~bangerth/

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