[petsc-dev] Check these out

[Matthew Knepley]

http://en.wikipedia.org/wiki/Composability

http://en.wikipedia.org/wiki/Levels_of_Conceptual_Interoperability

I think we can take it to Level 7!

  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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