求助：需要一个arXiv的endorsement
论坛里有人在arXiv上发布过四篇以上的论文吗？我需要一个endorsement，求助！(Xin Luo should forward this email to someone who's registered as an
endorser for the math.NA (Numerical Analysis) subject class of arXiv.)
Xin Luo requests your endorsement to submit an article to the math.NA
section of arXiv. To tell us that you would (or would not) like to
endorse this person, please visit the following URL:
https://arxiv.org/auth/endorse?x=Z9IFBG
If that URL does not work for you, please visit
http://arxiv.org/auth/endorse.php
and enter the following six-digit alphanumeric string:
Endorsement Code: Z9IFBG
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