Let Gbe a finite group and let H be a p-sylow group of G. If Nis a normal sub group of e prove that N H is a p-sylo low sub group of N. sub
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- 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 .43. Suppose that is a nonempty subset of a group . Prove that is a subgroup of if and only if for all and .Let G be a group and gG. Prove that if H is a Sylow p-group of G, then so is gHg1
- 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.Find all subgroups of the octic group D4.Show that every subgroup of an abelian group is normal.