Show that the following two conditions on a group G are equivalent: homomorphism p from G into Σ, such that p(g) + 1 for 4 (1) There is a some g € G. (2) The group G contains a proper subgroup of index at most n.
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- Let G be a group and gG. Prove that if H is a Sylow p-group of G, then so is gHg1Let be a group of order , where and are distinct prime integers. If has only one subgroup of order and only one subgroup of order , prove that is cyclic.Let G be a group of order pq, where p and q are primes. Prove that any nontrivial subgroup of G is cyclic.
- Let H be a subgroup of the group G. Prove that if two right cosets Ha and Hb are not disjoint, then Ha=Hb. That is, the distinct right cosets of H in G form a partition of G.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.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.