Mercurial > hg > Members > atton > delta_monad
view similer.hs @ 2:a5210ec1e41b
Reduce definition
author | Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp> |
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date | Sun, 31 Aug 2014 18:41:02 +0900 |
parents | 878d1e271709 |
children | 3c5fbce357af |
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{-# LANGUAGE FlexibleContexts #-} data Similer a b = Similer a (a -> b) b instance Functor (Similer a) where fmap g (Similer a f b) = Similer a (g . f) $ g b eta :: a -> Similer a a eta a = Similer a id a --mu :: (Eq (Similer b (b -> c) c)) => Similer a (a -> (Similer b (b -> c) c)) (Similer b (b -> c) c) -> Similer b (b -> c) c mu :: (Eq (Similer b c)) => Similer a (Similer b c) -> Similer b c mu (Similer a f b) = if ((f a) == b) then b else undefined