@MartinSleziak Now the post on meta about boolean-rings (and boolean-algebras) is deleted.

deleted-tag The tag absolute-geometry no longer exists. It was created in October. Since I do not see it in the revision history, it was either merged by a mod or removed by script which removes single occurrence tags older than six month (with no tag-wiki).

@MartinSleziak deleted-tag The tags chernoff-bounds and proof-analysis are gone too. Since they are not shown in the revision histories, I suppose they were removed in the same way: mathoverflow.net/posts/312723/revisions mathoverflow.net/posts/312753/revisions

@MartinSleziak deleted-tag The tag pseudocompact is gone too - probably by the script, too - it's not shown in the revision history.