Let G be a group. Define a relation on G as follows: N exists an a EG such that y = axa. (In this case, we say that y is conjugate to 2. y if there x). Prove that ~ is an equivalence relation on G. (24 points)
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- 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.15. Prove that on a given collection of groups, the relation of being a homomorphic image has the reflexive property.
- 17. Find two groups and such that is a homomorphic image of but is not a homomorphic image of . (Thus the relation in Exercise does not have the symmetric property.) Exercise 15: 15. Prove that on a given collection of groups, the relation of being a homomorphic image has the reflexive property.23. Let be the equivalence relation on defined by if and only if there exists an element in such that .If , find , the equivalence class containing.Label each of the following statements as either true or false. The relation of being a homomorphic image is an equivalence relation on a collection of groups.
- 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 .16. Suppose that and are groups. If is a homomorphic image of , and is a homomorphic image of , prove that is a homomorphic image of . (Thus the relation in Exercise has the transitive property.) Exercise 15: 15. Prove that on a given collection of groups, the relation of being a homomorphic image has the reflexive property.Exercises 35. Prove that any two groups of order are isomorphic.