PRT - U(n) is cyclic iff n = 1,2,4,pk and 2pk .
K. Ireland, M. Rosen, A classical introduction to modern number theory, Chapter 4.
The main part of the proof is showing it holds for an odd prime p.
I recall there is a proof in Rotman's book "Introduction to the theory of groups".
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[email protected] [email protected] facultad de matematicas uv xalapa
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