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== Additional Semigroup constraints == ...e> as a superclass...). If you get an error about "could not deduce <code>Semigroup</code> constraint" you probably just need to add one.

...trong> represents a set with an associative binary operation. This makes a semigroup a superset of [[Data.Monoid|monoids]]. Semigoups have no other restrictions <div>See also [[Data.Monoid]]: a <hask>Semigroup</hask> with an identity value.</div>

class Semigroup m where class Semigroup m => Monoid m where

|+ Semigroup > import Data.Semigroup

''For me that probably starts with the semigroup/group/ring setup, and good

...ve many useful operations. You can 'foldMap1' a non-empty container with a semigroup. You can 'traverse1' a non-empty container with a mere Apply (semi-applicat

applyUPre :: (Functor f, Semigroup s) => s -> f (t,s) -> f (t,s)

=Semigroup= A semigroup is a set <math>S\ </math> together with a binary operation <math>\oplus\ </