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Apr 7, 2019 at 7:49 comment added Seewoo Lee I like the proof, but I think this proof is not the kind of proof I want (I know that my question is too ambiguous, so it is hard to explain what I want in my mind). But anyway, thank you for introducing this proof! I saw this lemma as an exercise in Neukirch.
Apr 4, 2019 at 2:11 history answered Victor Protsak CC BY-SA 4.0