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Fri Oct 21 09:49:14 EDT 2011

## Fold or Map

I've been trying to see for a while where the fold belongs. The one
I'm using to fold (s -> i -> (s,o)) over [i] to produce [o].
The general form of this would be:
(s -> i -> (s, o)) -> (s -> f i -> (s, f o))
where f is a container type, i.e. lists. In case f is infinite we
can't have the state output, so we get:
-> (f i -> f o)
Note that for the processing code, f cannot be infinite and I really
do need the state output.
So.. what is this lift operation?

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