Let K be the splitting field of – 5 over Q. - • (a) Show that K = Q(V5,i/3) • (b) Explicitly describe the elements of Aut(K)
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- 14. Let be an abelian group of order where and are relatively prime. If and , prove that .Let H1={ [ 0 ],[ 6 ] } and H2={ [ 0 ],[ 3 ],[ 6 ],[ 9 ] } be subgroups of the abelian group 12 under addition. Find H1+H2 and determine if the sum is direct.Let H be a torsion subgroup of an abelian group G. That is, H is the set of all elements of finite order in G. Prove that H is normal in G.
- 16. Suppose that is an abelian group with respect to addition, with identity element Define a multiplication in by for all . Show that forms a ring with respect to these operations.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.
- 27. a. Show that a cyclic group of order has a cyclic group of order as a homomorphic image. b. Show that a cyclic group of order has a cyclic group of order as a homomorphic image.4. Prove that the special linear group is a normal subgroup of the general linear group .15. Prove that if for all in the group , then is abelian.
- 13. Assume that are subgroups of the abelian group . Prove that if and only if is generated bylet Un be the group of units as described in Exercise16. Prove that [ a ]Un if and only if a and n are relatively prime. Exercise16 For an integer n1, let G=Un, the group of units in n that is, the set of all [ a ] in n that have multiplicative inverses. Prove that Un is a group with respect to multiplication.Prove or disprove that H={ [ 1a01 ]|a } is a normal subgroup of the special linear group SL(2,).