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Sep 3 at 6:52 vote accept Fawen90
Sep 3 at 6:52 comment added Fawen90 What a nice observation. I fully forgot $F_\mu$ could be identified by the right derivative of $P_mu$. Thank you very much Iosif
Sep 2 at 15:40 history answered Iosif Pinelis CC BY-SA 4.0