(a). ker() ◄ G. (b). H≤G⇒(H) ≤ y(G). (c). H'G'⇒-¹(H') ≤G. Ali
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- 15. Prove that on a given collection of groups, the relation of being a homomorphic image has the reflexive property.5. For any subgroup of the group , let denote the product as defined in Definition 4.10. Prove that corollary 4.19:Exercises 31. Let be a group with its center: . Prove that if is the only element of order in , then .
- If f: Z -> Z is the map defined by f(x) = 2x. Is f a group homomorphism when the group operation on Z is addition? How would you prove it?List the six elements of GL(2, Z2). Show that this group is non-Abelian by finding two elements that do not commuteFind Aut(Z20). Use the fundamental theorem of Abelian groups to express this group as an external direct product of cyclic groups of prime power order.