center of group
preferred label: مرکز گروه @fa
type: Concept
related: commutative semi-group

commutative semi-group
related: center of group
broader: semi-group
preferred label: نیم‌گروه جابجایی @fa
type: Concept

semi-group
preferred label: نیم‌گروه @fa
type: Concept
narrower: commutative semi-group