Some time ago we had problems with Springer Encyclopedia of Mathematics, although they fixed the links after some time: Link Rot Notice: Springer EOM
Now I have noticed that many links to PlanetMath are not working. (The links which have form
What can we do to prevent problems like this?
- Should we ignore the potential problems when posting and if later the links stop working, then we can update them? (This might be a lot of work if some site is frequently used in posts. But if the target of the link still exists, but with a different url, this seems to me like a cleanest solution?)
- Or should we try to be proactive and include some kind of backup to the links we are using (for example, Wayback Machine) already when making a post? (In some cases even adding link to a Google Search might be a reasonable thing to do. If it is a reference to well-known fact, top hits among the search results might be useful for a user non familiar with it. And Google will update the links, if they change.)
- Links and references to papers seem to be a separate issue and they have been discussed elsewhere: What is the preferred way to link references to published material?