CENTRALIZERS
a person who centralizes or who advocates centralization, especially with regard to political or administrative organization.
a device fitted around a drilling string, pipe casing, etc., in order to keep it in a central position in a borehole.
the set of elements of a group which each commute with every element of a given subset of that group.
a device fitted around a drilling string, pipe casing, etc., in order to keep it in a central position in a borehole.
the set of elements of a group which each commute with every element of a given subset of that group.