Let Hand K be subgroups of an Abelian group. If |H| that HN Kis cyclic. Does your proof generalize to the case where |HN K| divides 2p where pis prime? = 12and |K| = 18prove
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- 10. Suppose that and are subgroups of the abelian group such that . If is a subgroup of such that , prove that .Let H1 and H2 be cyclic subgroups of the abelian group G, where H1H2=0. Prove that H1H2 is cyclic if and only if H1 and H2 are relatively prime.Prove or disprove that H={ hGh1=h } is a subgroup of the group G if G is abelian.
- 9. Suppose that and are subgroups of the abelian group such that . Prove that .13. Assume that are subgroups of the abelian group . Prove that if and only if is generated by31. (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.
- 11. Assume that are subgroups of the abelian group such that the sum is direct. If is a subgroup of for prove that is a direct sum.Let G be an abelian group of order 2n, where n is odd. Use Lagranges Theorem to prove that G contains exactly one element of order 2.If p1,p2,...,pr are distinct primes, prove that any two abelian groups that have order n=p1p2...pr are isomorphic.
- 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 .5. For any subgroup of the group , let denote the product as defined in Definition 4.10. Prove that corollary 4.19:Let G be a group of order pq, where p and q are primes. Prove that any nontrivial subgroup of G is cyclic.