I found so many web links became invalid on the questions and even more on the comments. Please be aware of this issue. In the future, this site needs to either repair the invalid links or advise users not to use the web links.
I think that many people around here are aware of problems with dead links and they do their best to help. (And the same is true about many other sites on the Stack Exchange network.) One thing is that it is recommended to add sufficient information about the referenced paper - so that even if th...
(from one of my comments) “Of course, the values of the tangent function can be “pushed through” with some work to obtain max/min values of the function (evaluate sine and cosine functions at the inverse-tangent values), $\ldots$” What follows is probably not what the author intended, but I'm pos...
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 http://planetmath.org/encyclopedia/....) What can we...
I don't think it is necessary to provide backup links in case links eventually rot. (In case the backup links rot, do you need backup links to those, too? And so on.) But what is important is that posts should be intelligible without accessing information at third-party sources (other web-sites, ...
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