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I have been studying this preprinted paper and the references therein. I believe that there are some typos; However, since I am not an expert yet, I would like to make sure I am correct.

I do not understand how the author made the restriction in the paragraph after equation (2.5)? in particular $ l \le 2j+2$.

Thanks in Advance.

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    $\begingroup$ Asking multiple questions in one post is not encouraged on MO. Also, doing so is not beneficial to the OP. Having only one question per post will likely attract more views, and people will likely be more willing to commit to answering just one question. $\endgroup$
    – Iosif Pinelis
    Commented May 16, 2022 at 3:51
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    $\begingroup$ Why don't you write directly to the Authors of the paper? usually, they appreciate your interest and are eager to know about possible errors in their work $\endgroup$
    – Piero D'Ancona
    Commented May 16, 2022 at 4:04
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    $\begingroup$ @IosifPinelis I edited the question. $\endgroup$
    – Mr. Proof
    Commented May 16, 2022 at 4:08
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    $\begingroup$ Apparently you never read Serre's "How to write mathematics badly". In particular his remark "On a theorem of Euler". $\endgroup$
    – Franz Lemmermeyer
    Commented May 16, 2022 at 5:34
  • $\begingroup$ @FranzLemmermeyer Sorry I did not understand! $\endgroup$
    – Mr. Proof
    Commented May 16, 2022 at 5:53

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