[petsc-users] How rto use multigrid?

[w_ang_temp]

Hello,
   I want to use the multigrid as a preconditioner. The introduction about it in the manual is little.
So are there some typical examples or details about multigrid? Is it used just like other preconditioners
like jacobi, sor, which can be simply used in the cammand line options?
   Thanks.
                                                                       Jim
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