which solvers do you think I can examin and see if they can be used instead of SolverCG?

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`That's the wrong question. If you know that the matrix you have *should be*`

`symmetric and positive definite, but the CG solver does not converge, then you`

`need to debug why the matrix *is not* s.p.d. Using a different solver might`

`allow you to solve the linear system, but since the linear system is`

`apparently not the correct one, the solution will also not be correct.`

Best W. -- ------------------------------------------------------------------------ Wolfgang Bangerth email: bange...@colostate.edu www: http://www.math.colostate.edu/~bangerth/ -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en

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