[petsc-dev] About the refine/coarsen in DM

[Ye Changqing]

Dear PETSc developers,

I am curious about the mystery behind ``refine'' and ``coarsen'' routines of DM. 

- As mentioned on the webpage, these routines appear to neglect the coordinate information associated with the current DM. I suspect that some graph-based algebraic operations might be involved. Could you kindly share the underlying design principles or implementation strategies behind these routines?

Best,
Changqing