Theorem Proof Let f: G→→ H be a group homomorphism. Then, Im fs H. The kernel of f, we write Ker f, is Ker f= {ge G: f(g) = en}. The Image of f, we write Im f, is Im f= {he H: h= f(g) for some g = G).
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- True or false Label each of the following statements as either true or false, where is subgroup of a group. 6. If a subgroup of a group is abelian, then must be abelian.Consider the additive group of real numbers. Let be a mapping from to , where equality and addition are defined in Exercise 52 of Section 3.1. Prove or disprove that each of the following mappings is a homomorphism. If is a homomorphism, find ker , and decide whether is an epimorphism or a monomorphism. a. (x,y)=xy b. (x,y)=2xSuppose that is an epimorphism from the group G to the group G. Prove that is an isomorphism if and only if ker =e, where e denotes the identity in G.
- Consider the additive group of real numbers. Prove or disprove that each of the following mappings : is an automorphism. Equality and addition are defined on in Exercise 52 of section 3.1. a. (x,y)=(y,x) b. (x,y)=(x,y) Sec. 3.1,52 Let G1 and G2 be groups with respect to addition. Define equality and addition in the Cartesian product by G1G2 (a,b)=(a,b) if and only if a=a and b=a (a,b)+(c,d)=(ac,bd) Where indicates the addition in G1 and indicates the addition in G2. Prove that G1G2 is a group with respect to addition. Prove that G1G2 is abelian if both G1 and G2 are abelian. For notational simplicity, write (a,b)+(c,d)=(a+c,b+d) As long as it is understood that the additions in G1 and G2 may not be the same binary 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 .Prove or disprove that H={ hGh1=h } is a subgroup of the group G if G is abelian.
- Exercises 18. Suppose and let be defined by . Prove or disprove that is an automorphism of the additive group .Suppose that G and G are abelian groups such that G=H1H2 and G=H1H2. If H1 is isomorphic to H1 and H2 is isomorphic to H2, prove that G is isomorphic to G.True or False Label each of the following statements as either true or false. Let H be a subgroup of a finite group G. The index of H in G must divide the order of G.
- 41. Let be a cyclic group, . Prove that 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.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 .