Dear Jean-Paul, I am new to deal.ii and C++ programming and never used Linear operators, so will have to study documentation. My understanding so far is that when using LinearOperators I am not actually constructing the matrix, but only know how such matrix would act on a vector. Am I correct? Could you please let me know whether I will be able to invert the matrix constructed by LinearOperators with a direct solver, or it would only be possible to use iterative solver.
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