the binary operation of 13. Let : Z6→ Zs be the map defined as a (a mod 5) for a e Zo. Determine whether is a homomorphism of groups. 14, Compute the cyclic subgroup of R+ generated by .
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- 15. Prove that on a given collection of groups, the relation of being a homomorphic image has the reflexive property.If a is an element of order m in a group G and ak=e, prove that m divides k.43. Suppose that is a nonempty subset of a group . Prove that is a subgroup of if and only if for all and .
- (See Exercise 31.) Suppose G is a group that is transitive on 1,2,...,n, and let ki be the subgroup that leaves each of the elements 1,2,...,i fixed: Ki=gGg(k)=kfork=1,2,...,i For i=1,2,...,n. Prove that G=Sn if and only if HiHj for all pairs i,j such that ij and in1. A subgroup H of the group Sn is called transitive on B=1,2,....,n if for each pair i,j of elements of B there exists an element hH such that h(i)=j. Suppose G is a group that is transitive on 1,2,....,n, and let Hi be the subgroup of G that leaves i fixed: Hi=gGg(i)=i For i=1,2,...,n. Prove that G=nHi.Suppose that the abelian group G can be written as the direct sum G=C22C3C3, where Cn is a cyclic group of order n. Prove that G has elements of order 12 but no element of order greater than 12. Find the number of distinct elements of G that have order 12.5. For any subgroup of the group , let denote the product as defined in Definition 4.10. Prove that corollary 4.19:
- Exercises 18. Suppose and let be defined by . Prove or disprove that is an automorphism of the additive group .15. Assume that can be written as the direct sum , where is a cyclic group of order . Prove that has elements of order but no elements of order greater than Find the number of distinct elements of that have order .31. (See Exercise 30.) Prove that if and are primes and is a nonabelian group of order , then the center of is the trivial subgroup . Exercise 30: 30. Let be a group with center . Prove that if is cyclic, then is abelian.