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Sep 26, 2021 at 3:37 comment added Deyi Chen And formula (4) in arxiv.org/abs/0912.5358 may be useful.
Sep 26, 2021 at 3:19 comment added Deyi Chen It seems that the paper available from core.ac.uk/download/pdf/82350429.pdf may be useful. Is there a more natural (or similar) way to prove the problems in Question 402572 and Question 403336 ?
Sep 26, 2021 at 0:56 history answered Max Alekseyev CC BY-SA 4.0