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A comment on Learning Haskell – A Racket programmer's foray into the land of Haskell. Parent comment
(.:) f g = (f .) . g
(.::) :: (d -> e) -> (a -> b -> c -> d) -> a -> b -> c -> d (.::) f g = ((f .) .) . g
Since fmap = (.), substitution would get your point free form.
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Since fmap = (.), substitution would get your point free form.