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Jun 8, 2017 at 13:20 history undeleted user21574
Jun 8, 2017 at 13:16 history deleted user21574 via Vote
Jun 8, 2017 at 9:10 comment added YCor Your post has no introduction and no conclusion, it's hard to guess what you claim to prove (and actually I don't understand Arnold's question in its edited [22 May 2015] form; I only understand its interpretation by @few_reps hoping that it matches the desired question - which is probably the case since his/her answer was accepted).
Jun 8, 2017 at 9:08 history edited YCor CC BY-SA 3.0
fixed typo and fixed confusion between additive and multiplicative notation of cyclic group of order 2
Jun 8, 2017 at 8:05 history edited user21574 CC BY-SA 3.0
added 116 characters in body
Jun 8, 2017 at 7:58 history edited user21574 CC BY-SA 3.0
added 518 characters in body
Jun 8, 2017 at 7:52 history answered user21574 CC BY-SA 3.0