Prove: If Aut(G) is cyclic, then so is any subgroup of it, in particular Inn(G). Inn(G) G/Z(G) where Z(G) is the center. If G/Z(G) is cyclic, the group is abelian.
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- Let H be a subgroup of a group G. Prove that gHg1 is a subgroup of G for any gG.We say that gHg1 is a conjugate of H and that H and gHg1 are conjugate subgroups. Prove that H is abelian, then gHg1 is abelian. Prove that if H is cyclic, then gHg1 is cyclic. Prove that H and gHg1 are isomorphic.Let G be a group with center Z(G)=C. Prove that if G/C is cyclic, then G is abelian.Prove or disprove that H={ hGh1=h } is a subgroup of the group G if G is abelian.
- 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 2.18. If is a subgroup of the group such that for all left cosets and of in, prove that is normal in.Exercises 30. For an arbitrary positive integer, prove that any two cyclic groups of order are isomorphic.
- 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.Show that a group of order 4 either is cyclic or is isomorphic to the Klein four group e,a,b,ab=ba.Let G be a group of order pq, where p and q are primes. Prove that any nontrivial subgroup of G is cyclic.
- 25. Prove or disprove that every group of order is abelian.13. Assume that are subgroups of the abelian group . Prove that if and only if is generated byTrue 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.