[Haskell-beginners] Monad for Pair

Kim-Ee Yeoh ky3 at atamo.com
Wed Nov 18 07:23:37 UTC 2015

On Wed, Nov 18, 2015 at 4:41 AM, Mike Houghton <mike_k_houghton at yahoo.co.uk>

And really return x  = P (x, x) doesn’t seem correct anyway.

But if you look at the type, which is essentially "a -> (a,a)" there's only
one way to write it, for the same reason that there's only one "a -> a"

Would someone please write the Monad with an explanation?

Much better if you let us know the source of this problem. Is this an
exercise from some book / online course?

-- Kim-Ee
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