Hello,
As my first question (which is an elementary math level question) and
considering step-20 as an example, I was wondering how two equations
(bilinear forms) containing two unknowns can be summed up to a single
equation? While for example in the case of a system of two linear equations
it is not allowed. (my guess: bilinear forms are still in integral form)
I noticed this lack of understanding when I was trying to implement a
vector valued problem. It is of nonlinear type and composed of two
equations. I linearized and discretized equations separately. Now I have a
2*2 matrix (consider A, B | A' , B') multiplied by {del.u ,del. v} (as
unknowns) and on the right hand side I have {f1, f2}.
So as my second question, am I still able to solve it at the current
shape? Could anyone point me to a similar step in deal.ii?
Step-23 looks very similar but still I am not sure how to construct the
matrix.
Thank you!
Ali
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