Let G and G' be groups. (a) If p: G → G' is a function, what is required for p to be a homomorphism? (b) Prove that if p : G → G' is an injective homomorphism and a e G, then |p(a)| = |a| %3D
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- Let G be an abelian group of order 2n, where n is odd. Use Lagranges Theorem to prove that G contains exactly one element of order 2.Exercises 31. Let be a group with its center: . Prove that if is the only element of order in , then .5. For any subgroup of the group , let denote the product as defined in Definition 4.10. Prove that corollary 4.19:
- Let G1, G2, and G3 be groups. Prove that if 1 is an isomorphism from G1 to G2 and 2 is an isomorphism from G2 to G3, then 21 is an isomorphism from G1 to G3. If 1 is an isomorphism from G1 to G3 and 2 is an isomorphism from G2 to G3, find an isomorphism from G1 to G2.15. Prove that if for all in the group , then is abelian.Prove part c of Theorem 3.4. Theorem 3.4: Properties of Group Elements Let G be a group with respect to a binary operation that is written as multiplication. The identity element e in G is unique. For each xG, the inverse x1 in G is unique. For each xG,(x1)1=x. Reverse order law: For any x and y in G, (xy)1=y1x1. Cancellation laws: If a,x, and y are in G, then either of the equations ax=ay or xa=ya implies that x=y.
- 27. a. Show that a cyclic group of order has a cyclic group of order as a homomorphic image. b. Show that a cyclic group of order has a cyclic group of order as a homomorphic image.Let G be a group with center Z(G)=C. Prove that if G/C is cyclic, then G is abelian.1.Prove part of Theorem . Theorem 3.4: Properties of Group Elements Let be a group with respect to a binary operation that is written as multiplication. The identity element in is unique. For each, the inverse in is unique. For each . Reverse order law: For any and in ,. Cancellation laws: If and are in , then either of the equations or implies that .