I've thought about writing extended tutorials on the relationship
between Haskell programming and category theory
you might find this a useful reference/starting point then:
http://citeseer.ist.psu.edu/62964.html
An Introduction to Category Theory, Category Theory Monads,
and Their Relationship to Functional Programming
Jonathan M.D. Hill, Keith Clarke
it's been a long time since i read this, and i seem to recall having to fix a
few typos before things made sense, but the reference still stuck in memory:)
claus
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