<p><strong>This applies to examples of duplicates that are not cross-postings by one individual. And, of course, that are on-topic here.</strong> </p>

<p>We can't close it as a duplicate, &amp; the post on Maths won't be found by anyone searching CV:
a post on another SE site has to be treated in the same way as any other external reference source. So, if that post's useful, link to it in a comment, or in an answer containing at least a brief account of what is to be found there.</p>
