Search
Now showing items 1-1 of 1
A classification of disjoint unions of two or three copies of the free monogenic semigroup
(2015-08-01)
We prove that, up to isomorphism and anti-isomorphism, there are only two semigroups which are the union of two copies of the free monogenic semigroup. Similarly, there are only nine semigroups which are the union of three ...