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view src/functor_class.hs @ 23:61e5659e04a9

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Add description for natural deduction
author Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp>
date Mon, 09 Feb 2015 22:13:18 +0900
parents 086fc8bb6ea9
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class Functor f where
  fmap :: (a -> b) -> f a -> f b