(4) Let (G, *) be a group and assume that z, a, b € G. Let also that c = x *a*r¹ and d = x * b*x-¹. Show that a * b = b* a if and only if cd=d*c.
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- 14. Let be an abelian group of order where and are relatively prime. If and , prove that .Let H1 and H2 be cyclic subgroups of the abelian group G, where H1H2=0. Prove that H1H2 is cyclic if and only if H1 and H2 are relatively prime.Find the normalizer of the subgroup (1),(1,3)(2,4) of the octic group D4.