The nonlinear system support in the library looks very promising.
However I have a hard time to see how solve a nonlinear system within
the given framework. Where does the nonlinearity enter the picture?
Is this in the assembly function, where some quantities are calculated
based on the solution vector?
If somebody could post a simple example, that would be great. And
would it make sense to refactor example 13 (as example 16)?
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