> Questions in which books play a key-role, such as questions on antique books, e-books, difference between various editions of a book, etc. For questions asking for recommendations of books on some subject the tag textbook-recommendation is often more suitable.
@MartinSleziak @MartinSleziak indeed I agree books can be removed or replaced with textbooks Additionally I'd suggest to add banach-spaces along the way.
I have edited the tags: mathoverflow.net/posts/37540/revisions It goes without saying that if somebody has further improvements to the choice of tags, they are more than welcome.
dead-link A link in Jim Belk's answer "What's a non-abelian totally ordered group?" was no longer working - I have edited it to the new link to authors' website. Probably link to arXiv might be better - but perhaps this is decision which might be left to the answerer.
The link in the post seems to be dead, but it is probably the link to the paper Bi-orderings on pure braided Thompson's groups by Jose Burillo, Juan Gonzalez-Meneses, which is available on arXiv and on the author's website (Wayback Machine). — Martin Sleziak39 secs ago
In general, perhaps it might be useful to have some post on meta with recommendations for links to paper. (For example, it seems to be useful to mention something which makes the paper identifiable even if the link no longer works. If not full citation, at least doi or something similar.)