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Jul 22, 2023 at 3:40 vote accept PPB
Jul 21, 2023 at 14:17 comment added Iosif Pinelis @PPB : Thank you for your comment.
Jul 21, 2023 at 10:27 comment added PPB We can also take $x=(1, 1,0,...)$ and $y=(-1, 1,0,...)$ to check that $I_n=0$ but $x \neq y$.
Jul 20, 2023 at 18:19 history edited Iosif Pinelis CC BY-SA 4.0
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Jul 20, 2023 at 16:01 comment added Iosif Pinelis @PriyankaPriyadarshiniBehera : I have added the details on the "No", which completes the answer to your question.
Jul 20, 2023 at 15:58 history edited Iosif Pinelis CC BY-SA 4.0
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Jul 20, 2023 at 15:35 comment added Iosif Pinelis @PriyankaPriyadarshiniBehera : (i) You wrote "I was looking for two sub-sequences and their weak limits to verify. I would be obliged if you could give me a hint on how to proceed to get the answer to be YES for $\sum_{i=1}^\infty$. I can supply these details if this is all that you need. (ii) What is your definition of rotundity and what is the purpose of your comment about the rotundity? .
Jul 20, 2023 at 2:50 comment added PPB Also, I think the norm will be rotund if we take $\sum_{i=1}^\infty$. And the norm mentioned above is not rotund.
Jul 20, 2023 at 2:44 comment added PPB I appreciate your answer. However, I was looking for two sub-sequences and their weak limits to verify. I would be obliged if you could give me a hint on how to proceed to get the answer to be YES for $\sum_{i=1}^\infty$.
Jul 19, 2023 at 19:17 history answered Iosif Pinelis CC BY-SA 4.0