Centralizers of a monounary algebra
Danica Jakubı́ková-Studenovská, Miroslava Šuličová · Asian-European Journal of Mathematics · 2015
The centralizer of an algebra is defined as the set of all transformations of the algebra which commute with all fundamental operations. Further, the second centralizer is the set of all transformations which commute with all elements of the (first) centralizer. The paper characterizes the monounary algebras having the property that the first and the second centralizers coincide.