Provide a two-column proof of Theorem 3: Finite Subgroup Test.
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- Let H and K be subgroups of a group G and K a subgroup of H. If the order of G is 24 and the order of K is 3, what are all the possible orders of H?34. Suppose that and are subgroups of the group . Prove that is a subgroup of .43. Suppose that is a nonempty subset of a group . Prove that is a subgroup of if and only if for all and .
- Let be a group of order 24. If is a subgroup of , what are all the possible orders of ?If H and K are arbitrary subgroups of G, prove that HK=KH if and only if HK is a subgroup of G.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.
- 28. For an arbitrary subgroup of the group , the normalizer of in is the set . a. Prove that is a subgroup of . b. Prove that is a normal subgroup of . c. Prove that if is a subgroup of that contains as a normal subgroup, then4. List all the elements of the subgroupin the group under addition, and state its order.Find two groups of order 6 that are not isomorphic.