Question: New year, new tag management thread.

Rules of the game are basically [the same](https://math.meta.stackexchange.com/q/27653/43351):

* Post your suggestion as an answer here if you see
	+ A particularly bad tag (a rule of thumb: «if I can't imagine a person classifying a tag as either interesting or ignored, I'm getting rid of it»),
	+ A tag that should be a synonym of an existing one,
	+ A tag that used for two or more completely unrelated things,
	+ A need to create a new tag;
* Upvote/downvote/comment as your agree/disagree with suggestions, so please post different suggestions in separate answers;
* Wait a couple of days before implementing a suggestion.
* After the problem described in an answer is resolved, please edit it to say so.
* If your tag suggestion exists in a separate question, please provide a link to the question in your suggestion.

See also:

* The [list with pending and approved synonyms](https://math.stackexchange.com/tags/synonyms).
* The [tagging chatroom](http://chat.stackexchange.com/rooms/3740/tagging) for extended discussion on tagging.
* [Last year's thread](https://math.meta.stackexchange.com/q/27653/43351) to look for suggestions that need to be implemented.

Also, note that one may use `[tag:calculus]` for [calculus](https://math.stackexchange.com/questions/tagged/calculus "show questions tagged 'calculus'"), i.e. tags on the main site, and `[meta-tag:discussion]` for [discussion](/questions/tagged/discussion "show questions tagged 'discussion'"), i.e. for tags on the meta site.

Answer: 
> 
> **Partially resolved.** [tqft](https://math.stackexchange.com/questions/tagged/tqft "show questions tagged 'tqft'") has been synonymized into [topological-quantum-field-theory](https://math.stackexchange.com/questions/tagged/topological-quantum-field-theory "show questions tagged 'topological-quantum-field-theory'"). A consensus has not yet been reached on the name change to [topological-quantum-field-theories](https://math.stackexchange.com/questions/tagged/topological-quantum-field-theories "show questions tagged 'topological-quantum-field-theories'").
> 
> 
> 

**Proposal: rename "topological-quantum-field-theory" to "topological-quantum-field-theories" and synonymise it with the tag "tqft"**

An [old question of mine](https://math.stackexchange.com/questions/586296/applications-of-tqfts-beyond-physics) recently had a couple of attempts to change the tags, which were approved (and I agree). In the process, the new tag [topological-quantum-field-theory](https://math.stackexchange.com/questions/tagged/topological-quantum-field-theory "show questions tagged 'topological-quantum-field-theory'") was created, which I agree is better than the previous [tqft](https://math.stackexchange.com/questions/tagged/tqft "show questions tagged 'tqft'") tag. However, a topological quantum field theory is a mathematical object like a group or a functor, and so the tag should be pluralised to distinguish it from a subject.
**Proposal: rename** `quasiperiodic-functions` **to** `quasiperiodicity`.

**Reason:** posts tagged `quasiperiodic-functions` may also be tagged `quasiperiodicity`, but the reverse is not always true (ie. posts on quasiperiodic tiling or oscillations). Because none of these topics get much attention, there should be one tag to cover all of them.