Dear all,

First of all, thanks for the great library! I spent the last few days 
reading your (very!) extensive 
documentation and I think it will be really useful for me in the near 
future. 

Right now I am struggling a bit on understanding some things on step-44. 
Most pressing right 
now is that, in Section Solid::make_constraints of the tutorials, we have 

> However, since we are dealing with an iterative Newton method, it should 
be noted 
> that any displacement constraints should only be specified at the zeroth 
iteration 
> and subsequently no additional contributions are to be made since the 
constraints 
> are already exactly satisfied.

However, reading the code underneath, the code under the if-else blocks are 
the same (around 
line 2490 of step-44.cc). That is to say, we would run the same computation 
whether the condition 
is true or false. This calculation does not happen anyway, because of the 
early return in line 2466. 
If we disregard this early return, would this code be wrong, or is there 
something I am not seeing?

Bests,
Lucas 

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