Hello everyone,

I've been reading through some of the matrix-free tutorials---step-67 in 
particular. I'd like to write something similar, an RKDG solver for 
hyperbolic problems for which I can use explicit RK time integration.

   - Does it make sense to use the MatrixFree functionality with regular 
   Vector<Number> operands? The tutorials often make use of 
   LinearAlgebra::distributed::Vector<Number> objects to store the vectors.
   - I don't want to use the latter because I'm driving the code from 
   Python, and any use of MPI or distributed memory could be a headache in 
   communicating data back and forth between the two languages. Additionally, 
   I'm solving many small problems as opposed to a single large one.
   - Ultimately, I'm looking for a fast way to apply the elemental inverse 
   mass matrices and face integrations, so MatrixFree functionality seemed the 
   logical choice.

Best, 
Corbin

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