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Jun 17, 2018 at 21:50 vote accept Stefan Kohl
Jun 16, 2018 at 10:32 comment added Fedor Petrov Yes, this looks very classical, but I am illiterate in number theory and do not know what to cite. Also it would be nice to find some completely elementary argument.
Jun 16, 2018 at 10:10 comment added Stefan Kohl Wow! -- By the way -- I thought there might be an answer of the form "This follows from Theorem so-and-so in so-and-so" -- but a direct proof is of course even nicer. -- Unless some mistakes turn up quickly, I will 'accept' this answer.
Jun 16, 2018 at 9:23 history edited Fedor Petrov CC BY-SA 4.0
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Jun 16, 2018 at 9:08 history edited Fedor Petrov CC BY-SA 4.0
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Jun 16, 2018 at 8:34 history answered Fedor Petrov CC BY-SA 4.0