The following conditions on a group Gare equivalent: (i) G is abelian; (ii) (ab) 2 = a

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The following conditions on a group Gare equivalent: (i) G is abelian; (ii) (ab)2 = a2b2 for all a,b ϵ G; (iii) (ab)-1 = a-1b-1 for all a, b ϵ G; (iv) (ab)n = anbn for all n c Z and all a,b ϵ G; (v) (ab)n = anbn for three consecutive integers n and all a,b ϵ G. Show that (v) ⇒ (i) is false if "three" is replaced by "two."

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