: G → Exercise 14.5. Let G be a group and R be a ring. Show that every group homomorphism R* can be uniquely extended to a ring homomorphism & : Z[G] → R satisfying that (g) = (g) for every g € G.
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- 5. For any subgroup of the group , let denote the product as defined in Definition 4.10. Prove that corollary 4.19:Exercises 30. For an arbitrary positive integer, prove that any two cyclic groups of order are isomorphic.Exercises 18. Suppose and let be defined by . Prove or disprove that is an automorphism of the additive group .
- 16. Suppose that is an abelian group with respect to addition, with identity element Define a multiplication in by for all . Show that forms a ring with respect to these operations.44. Let be a subgroup of a group .For, define the relation by if and only if . Prove that is an equivalence relation on . Let . Find , the equivalence class containing .Let G be a group. Prove that the relation R on G, defined by xRy if and only if there exist an aG such that y=a1xa, is an equivalence relation. Let xG. Find [ x ], the equivalence class containing x, if G is abelian. (Sec 3.3,23) Sec. 3.3, #23: 23. Let R be the equivalence relation on G defined by xRy if and only if there exists an element a in G such that y=a1xa. If x(G), find [ x ], the equivalence class containing x.
- Prove or disprove that H={ hGh1=h } is a subgroup of the group G if G is abelian.For each a in the group G, define a mapping ta:GG by ta(x)=axa1. Prove that ta is an automorphism of G. Sec. 4.6,32 Let a be a fixed element of the group G. According to Exercise 20 of Section 3.5, the mapping ta:GG defined by ta(x)=axa1 is an automorphism of G. Each of these automorphisms ta is called an inner automorphism of G. Prove that the set Inn(G)=taaG forms a normal subgroup of the group of all automorphisms of G.Let a and b be elements of a group G. Prove that G is abelian if and only if (ab)2=a2b2.