monoid
algebraic structure with an associative operation and an identity element
aperiodic monoid
aperiodic semigroup which is a monoid
bicyclic semigroup
algebraic object important for the structure theory of semigroups
topological monoid
Concept in mathematics
Cartesian monoid
monoid, with additional structure of pairing and projection operators
free monoid
concept in mathematics
group
algebraic set with an invertible, associative internal operation admitting a neutral element