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View Code? Open in Web Editor NEWDay 9 of Advent of Haskell - Denotational Design
Day 9 of Advent of Haskell - Denotational Design
@smatting kindly took the time to write a document with some questions, which I link here.
First of all thanks for the questions!
You can get
Functor
implementation fors
for free by using using two facts
- the Homomorhism Property for
mu
:mu (fmap f s) = fmap f (mu s)
mu
andmu'
are inverseIs that correct?
Yes, that's exactly it! The original DD paper has a section about it that goes into more detail, but basically if you are able to have a computable inverse (mu'
) you can calculate a solution much more easily!
Does this mean
f
would only get applied to head?
Isn't that an incorrectFunctor
implementation for a stack?
Good eye! That was indeed an error in my post which I have already fixed! Thanks for pointing it out. I forgot to propagate the fmap
and it lead to a wrong calculation.
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