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I see that the post on meta "Should we delete or reopen these old posts?" already lead to some reopen votes - the question "finite index, self-normalizing subgroup of $F_2$" is now in the reopen review queue.

@MartinSleziak new-tag The newly created operations-research tag now has a tag-excerpt. mathoverflow.net/review/suggested-edits/126267

specific-question The tag books doesn't seem right for: Reference for weak*-semigroup (recently bumped). I would either omit it completely or replace with textbook-recommendation. (At least the usage doesn't seem consistent with the tag-info for books.)

> 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 same link is in this answer: Examples of non-abelian groups arising in nature without any natural action.

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.)