Let f be the homomorphism f Z15 GL(2) of groups such that (1)-A, where A- a) Give the definition of f. b) Find K- Ker() and Zis /K. ) Find Im() and the bijective correspondence between Z/K and Im().
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- Exercises 35. Prove that any two groups of order are isomorphic.Exercises 22. Let be a finite cyclic group of order with generators and . Prove that the mapping is an automorphism of .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 .
- 32. Let be a fixed element of the group . According to Exercise 20 of section 3.5, the mapping defined by is an automorphism of . Each of these automorphism is called an inner automorphism of . Prove that the set forms a normal subgroup of the group of all automorphism of . Exercise 20 of Section 3.5 20. For each in the group , define a mapping by . Prove that is an automorphism of .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.Let G be an abelian group. For a fixed positive integer n, let Gn={ aGa=xnforsomexG }. Prove that Gn is a subgroup of G.
- Prove or disprove that H={ hGh1=h } is a subgroup of the group G if G is abelian.For a fixed group G, prove that the set of all automorphisms of G forms a group with respect to mapping composition.5. For any subgroup of the group , let denote the product as defined in Definition 4.10. Prove that corollary 4.19: