EntityQ3041173· pop 14· linked from 132 articlesgroup extensionSign in to savegroup for which a given group is a normal subgroupConnectionsquotient groupEntityexact sequenceEntitycovering spaceEntitymathematicsEntityquantum mechanicsEntityInternational Standard Book NumberEntityWayback MachineEntitydigital object identifierEntitygroupEntitytheoretical physicsEntityFourier transformEntityisomorphismEntityinjectionEntityabelian groupEntitynumber lineEntitysurjective functionEntityalgebraic topologyEntityif and only ifEntityhomomorphismEntityidentity functionEntityCategoriesGroup theory