(Optional) Defines which parallel coarsening algorithm is used
(Optional) Defines which parallel coarsening algorithm is used. There are the following options for coarsen_type:\begin{tabular}{c l} 0 & CLJP-coarsening (a parallel coarsening algorithm using independent sets.
1 & classical Ruge-Stueben coarsening on each processor, no boundary treatment (not recommended!)
3 & classical Ruge-Stueben coarsening on each processor, followed by a third pass, which adds coarse
& points on the boundaries
6 & Falgout coarsening (uses 1 first, followed by CLJP using the interior coarse points generated by 1
& as its first independent set)The default is 6.
alphabetic index hierarchy of classes
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