Showing that $ U(2^n) $ is not a cyclic group for $ n \geq 3 $

Asked Oct 23 '13 at 08:49

Active Oct 23 '13 at 17:45

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Could anyone please explain to me why $ U(2^n) $ is not a cyclic group for $ n \geq 3 $? I need help on this because I have an algebra exam tomorrow. Thanks!

edited Oct 23 '13 at 17:45

dfeuer

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asked Oct 23 '13 at 08:49

Ziya

Showing that $ U(2^n) $ is not a cyclic group for $ n \geq 3 $

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