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Bernd Flemisch authored
AMG backend. Checking for this variable avoids that PDELab has to be patched even if one does not want to use the backend. Not a very elegant solution, better ones are welcome. Brought to attention by Markus. git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@10183 2fb0f335-1f38-0410-981e-8018bf24f1b0
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