[Haskell-cafe] Foldable/Traversable and Applicative/Monoid?
capn.freako at gmail.com
Fri Feb 5 18:45:10 UTC 2016
I don't understand why Foldable is a necessary super-class of Traversable,
and I suspect that the Applicative/Monoid duality, which I've just begun
discovering in the literature, has something to do with why that is so.
Can anyone give me a hint, without giving me the answer?
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