The subset of a ring, group or semi-group $R$ consisting of elements that commute (are interchangable) with all elements of a certain set $X\subseteq R$; the centralizer of $S$ in $R$ is denoted by $C_R(S)$. The centralizer of an irreducible subring (that is, one not stabilizing proper subgroups) of endomorphisms of an Abelian group in the ring of all endomorphisms of this group is a division ring (Schur's lemma).
|||N. Jacobson, "Structure of rings" , Amer. Math. Soc. (1956)|
Centralizer. Encyclopedia of Mathematics. URL: http://www.encyclopediaofmath.org/index.php?title=Centralizer&oldid=31550