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Jan 25, 2021 at 14:27 comment added Iosif Pinelis @Yilmis : So, are you now satisfied with the answer?
Jan 25, 2021 at 7:25 comment added Yilmis Thank you very much for your help!
Jan 24, 2021 at 2:30 comment added Iosif Pinelis @Yilmis : They apparently meant something like the now added bound (2).
Jan 24, 2021 at 2:29 history edited Iosif Pinelis CC BY-SA 4.0
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Jan 23, 2021 at 15:13 comment added Yilmis I was told that there is somewhere an inequality involving the coefficients a_n by the (smaller) quantity sup \sum_n \langle y, a_n \rangle^2, where the sup is over all y in H with norm one?
Jan 22, 2021 at 16:00 history edited Iosif Pinelis CC BY-SA 4.0
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Jan 22, 2021 at 15:15 history answered Iosif Pinelis CC BY-SA 4.0