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Shouldn't this either be renamed to something like "Monads in Haskell" with a link to understanding Haskell, or have the equations written in a common mathematical way?
:If I understand correctly, monads are containers for values: for example, a monad value like "Just 5" contains the value 5. The return function "wraps" a value inside a monad, the fmap function allows another function to "look inside" a monad value, and it looks like join turns a value like Just (Just 5) into Just 5, or <nowiki>[[3]]</nowiki> into [3]. A few examples:
return 3 = either [3] or Just 3 -- "Wrap" the value 3 with a monad
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