The Hunchback of Notre Dame features a character.
In mathematics , an aperiodic semigroup is a semigroup S such that every element x ∈ S is aperiodic , that is , for each x there exists a positive integer n such that xn = xn + 1 .. mathematics. mathematics. semigroup. semigroup. positive integer. positive integer. An aperiodic monoid is an aperiodic semigroup which is a monoid .. semigroup. semigroup. monoid. monoid