[Haskell-cafe] Re: what is inverse of mzero and return?

Jules Bean jules at jellybean.co.uk
Tue Jan 25 07:26:54 EST 2005

On 25 Jan 2005, at 12:22, Jules Bean wrote:

> The concrete example for [] is:
> concat . (map concat)
> should be the same (on all values of all types [a]) as
> concat . concat

..tiny correction, sorry. 'On all values of all types [[[a]]]'.

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