center of group
preferred label: مرکز گروه @fa
type: Concept
related: upper central serie

quotient group
preferred label: گروه خارج قسمتی @fa
type: Concept
related: upper central serie

upper central serie
related: quotient group
related: center of group
broader: group
preferred label: سری مرکزی بالایی @fa
type: Concept

group
preferred label: گروه @fa
type: Concept
narrower: upper central serie