class sage.categories.commutative_additive_semigroups.CommutativeAdditiveSemigroups(base_category)

The category of additive abelian semigroups, i.e. sets with an associative and abelian operation +.

EXAMPLES:

sage: C = CommutativeAdditiveSemigroups(); C
sage: C.example()
An example of a commutative monoid: the free commutative monoid generated by ('a', 'b', 'c', 'd')

sage: sorted(C.super_categories(), key=str)

This category is currently empty and only serves as a place holder to make C.example() work.