[petsc-dev] Explicit time stepping

[Matthew Knepley]

How do we incorporate a mass matrix into the explicit form

  U_t = G(U, t)

This is pretty common, and I need it for PyLith.

  Thanks,

     Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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