Dear all,

I am trying to use a multigrid preconditioner to solve a PDE with two 
domains, in which the resulting matrix will be a block matrix. I am trying 
to replicate what is in step-16 tutorial program, but turns out it doesn't 
work since there are separate dof handlers for two domains, and I have no 
way to construct the PreconditionMG object to handle the dofs from both 
domains (since we can't combine two dof handlers into one). 

Does deal.II provide a block preconditioner for multigrid, or do I have to 
implement my own from scratch by inheriting from Subscriptor class?

I would greatly appreciate your help in this matter.

Regards,
Chayapol

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