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Jul 22, 2022 at 1:49 vote accept David E Speyer
Jul 20, 2022 at 18:36 answer added Kevin timeline score: 1
Jul 20, 2022 at 18:13 comment added David E Speyer Thanks! The first part of mathoverflow.net/a/345976/297 answers the main question then. I still think the observation that it is always the factor with the root of $e^{(2 \pi i)/p}$ that gets the negative coefficient is interesting, so I'll leave it open to see if anyone has anything to say about that then. @ColinMcQuillan
Jul 20, 2022 at 16:49 comment added Colin McQuillan See mathoverflow.net/questions/345884/…
Jul 20, 2022 at 1:44 history asked David E Speyer CC BY-SA 4.0