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May 30, 2016 at 19:01 comment added Hoot Just a note: the book of Nakayama to which I think you are referring seems to be freely available from Project Euclid.
Oct 5, 2011 at 2:04 vote accept Zhengyu Hu
Oct 4, 2011 at 18:38 answer added mrw timeline score: 3
Oct 4, 2011 at 15:37 comment added Zhengyu Hu How to prove there are only a finite number of prime divisors $\Gamma$ such that $\sigma_{\Gamma}(L)>0$
Oct 4, 2011 at 14:36 comment added naf $N_{\sigma}(L)$ is a divisor by definition so it is not clear what you think needs to be proved.
Oct 4, 2011 at 10:35 history asked Zhengyu Hu CC BY-SA 3.0