On Mon, Dec 28, 2009 at 10:32 PM, Jonathan Fischoff
> I would to create a list of tuples (or something similar) of invertible
> [((a -> b), (b -> a)), ((b -> c), (c -> b)), ....
> Such that I could call
> forward invertibleFuctionList domainValue = ? -- composite all the functions
> backward invertibleFuctionList rangeValue =
> forward (reverse invertibleFuctionList) rangeValue -- or something
> I would also like to concat them. This sounds like a job for GADT that
> someone might have already tackled. Any ideas?