12 let be a homomoaph ism som gi o 92 leb he c g2 be a nosmal 3ubgsou of then o-() egs is nevex a noomal subosoub of 7 nobmal iff ga s aludap a nosmal sn boysou

12 Let be a homomoaph ism som Gi o 92 Leb He c G2 be a nosmal 3ubgsou of Then o-() eGs is Nevex a noomal Subosoub of 7 Nobmal iff Ga s Aludap a nosmal Sn boysoup Neud not be a nomal subysop 0f yi abelian 3/5