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May 14, 2022 at 6:49 comment added Zhi-Wei Sun Great! From your analysis, it's not easy to find a second counterexample. Possibly the counterexample you give is essentially the only counterexample.
May 14, 2022 at 6:44 vote accept Zhi-Wei Sun
May 12, 2022 at 22:09 comment added user44143 Can you give the roots of the counterexample explicitly?
May 12, 2022 at 22:00 history answered dan_fulea CC BY-SA 4.0