<p>I for one posted several links (PDF or HTML files) in several answers of mine or in comments, and it appears that many are just dead. I can fix some of them here and there, but I wonder: Shall we just update all of them using, e.g., the <a href="https://archive.org/web/" rel="nofollow noreferrer">Wayback Machine</a>, or is there an established policy regarding dangling pointers on the SE network, and in particular on Cross Validated?</p>
