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6:53 AM
As mentioned before, I am not really sure what is most suitable as the top-level tag for semigroups. I have replaced the deprecated tag by [gr.group-theory] in this recent question: Some questions about homogroups
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Q: Some questions about homogroups

M.H.HooshmandEvery semigroup containing an ideal subgroup is called a homogroup. Let $(S,\cdot)$ be homomgroup, hence it contains an ideal $I$ that is also a subgroup. It is easy to see that $I$ is the least ideal, a maximal subgroup of $S$, and its identity (denoted by $e_I$) is a central idempotent of $S$....

 
 
6 hours later…
12:56 PM
Recently the tag wiki for was updated to mention . The edit summary was: added universal-algebra although it's not top-level: many questions about algebraic structures should fall here; mathoverflow.net/posts/233412/revisions mathoverflow.net/review/suggested-edits/93715
The tag-excerpt now reads:
> Deprecated; do NOT use this tag. Instead you could consider gr.group-theory, ac.commutative-algebra, ra.rings-and-algebras, universal-algebra, or various more specific tags.
 

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