mitchell_01, a dealii code which solves the Mitchell "Analytic solution" problem.
Mitchell's "analytic solution" problem involves the Poisson equation on the [0,+1]x[0,+1] square, with zero boundary conditions.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
The DEAL.II implementations of these problems was done by Lukas Bystricky, of the Department of Scientific Computing, Florida State University.