It&#x27;s only an obligation to the extent that he wants anyone else to appreciate the work. Don&#x27;t read it as &quot;he <i>should</i> do X&quot; but as &quot;he should do X <i>if he wants others to read his proof</i>&quot;.<p>Whether he does or not is a different question. I think it&#x27;s <i>likely</i> that he does, but perhaps he&#x27;s content knowing that he devised a proof himself.<p>And, for what it&#x27;s worth, communicating results <i>and</i> impact are both usually part of a researchers job description. That might not matter so much thanks to tenure, but it&#x27;s still there in spirit.