# Tag Info

24

Resolved. collatz renamed to collatz-conjecture. Proposal: Rename collatz to collatz-conjecture. Although Lothar Collatz is most known for the $3x+1$ problem (the Collatz Conjecture), I don’t think their names should be used interchangeably. Furthermore, the latter tag has a more informative name. I posted this in the last Tag Management, but I only got ...

15

I have no strong feelings about whether there should be a separate tag about the number 'e'. (It was convenient way back when, when most of the questions tagged 'e' is about the function $e^x$.) I do think that the names can be confusing, whenever something has to do with Euler. Maybe, if we want to rename: For the number '$e$', name the tag 'eulers-...

13

Proposal: Create the tag eulerian-numbers. The Eulerian number $A(n,k)$ is the number of permutations in $S_n$ with exactly $k$ descents, and it is an important combinatorial object. Searching for "Eulerian numbers" is:q returns around 30 legitimate hits, which is a worthwhile number of questions to have a tag attached, in my opinion. I had also raised ...

11

Proposal: Create a tag umbral-calculus. In this question the asker asks why there is no tag for questions related to the umbral calculus. I am in agreement with Alexander Gruber's comment that the significant number of otherwise unorganized questions on the topic is a good indication that the tag is needed. Proposed Tag Excerpt: Umbral calculus refers ...

10

Proposal: Remove gre-exam, gmat-exam. These are meta tags with very bare-bones tag wikis. Furthermore, there aren’t any other tags for important math exams, i.e. the IMO or USAMO, so why should we make an exception for these two?

10

There is no very deep reason. In the post you linked to a list of very short tags was highlighted. I then went through the list and decided what to do, commenting: I did something about all proposals. I am not sure I chose the best option each time but it's easy to change. Feel free to comment obviously. Maybe it's best to take the changed version as a ...

9

Technically it was not a change of the name. What happened is that I recently switched the direction of the synonym between pde and partial-differential-equations. It used to be the case that a questions to be tagged partial-differential-equations was automatically retagged as pde. Now it is the other way round. As Martin mentioned that's discussed at ...

8

Proposal: Eliminate the tag transformation. The tag transformation is too broad—there are a large number of things in mathematics called "transformations" coming from diverse parts of mathematics, and tagging a question with this tag does nothing to refine or sort these different notions. I would like to see this tag dead and buried. I have spent ...

7

Proposal: Remove the new tag algebraic-proofs. I think it is easily abused and not particularly useful (doesn't convey any interesting information to answerers).

7

Proposal: eliminate the tag expression-simplification The tag expression-simplification has 150 questions under it. As a rather vague tag, it has seen a spike of usage in the past few months (I have already removed it from the 20 most recent questions). Leaving it untouched will only confuse more newbies about which tag suits the question best.

6

There is an obvious connection between $e$ and the exponential function $e^x$ (in the strict sense - could also be $a^x$). But the one is a number, important enough to deserve specific study, and the other a function. There must be a substantial corpus on both topics. I would vote for a tag "$e$", separate from "exponential-function", having the synonym "...

6

Proposal: Combine ceiling-function and floor-function, maybe into ceiling-and-floor-functions. This feels similar to limsup-and-liminf: yes, there are results that deal exclusively with one of the two (for instance, Fatou's Lemma and liminf; or questions about Waring's problem and floors), but the two functions feel like two sides of the same coin. There are ...

6

Proposal: Eliminate the discontinuous-functions tag. It seems clear that the continuity tag is enough for questions about discontinuous functions.

6

Using Data Explorer (SEDE) you can check how has the number of questions in some given tag evolved over time. Here are two queries, one showing absolute number of questions in the elementary-set-theory, the other one showing percentage of all question which have this tag. The latter is taken from here: A statistical question about statistical questions. ...

6

Questions on the history of mathematics are still on-topic on this site. Thus, there is no direct need to change this (although I personally would likely not start the list with 'history', but ultimately it likely does not change much). To answer the question on how one could change it, these descriptions can be edited directly by "trusted users" (that is, ...

5

My understanding is that most of the time, someone who asks a question on an elementary topic will not be able to name precisely what the relevant tags are. In such cases, it's all up to more senior users to tidy things up. But then not all questions get re-tagged properly because there are too many of them, because not everyone thinks of taking care of ...

5

Proposal : create grothendieck-group to differentiate from grothendieck-construction. The tag grothendieck-construction currently has 18 questions, 12 of which are about the Grothendieck group rather than the Grothendieck construction (there is no tag-wiki). A search for "Grothendieck construction" (without the quotation marks) returns 70 questions, and ...

5

Following an earlier discussion I approved a synonym elementary-probability to probability. Likely down the road a merge will happen. The main reasons are: we do not separate tags by level, and in this case there even is probability-theory that is an "advanced" tag so that further separation seems not useful. the community did over the past two years ...

5

Proposal: Add the tag grad-curl-div; make gradient, curl and divergence aliases thereof. Edit 2: I've revised the proposal statement to Alexander Gruber's (in my view superior) suggestion in the comments. Implementing this proposal poses some advantages over the status quo: It would (productively) free the > 6k questions about the gradient from the ...

5

Proposal: Merge gaussian and normal-distribution. I'm no statistician, but I don't see the value in having both tags. Looking at the questions under gaussian, there doesn't seem to be anything that doesn't fall under the tag normal-distribution.

5

Proposal: Make division-ring a synonym of division-algebras. I don't think there is much difference. We can argue whether a division algebra is always associative or not. I wrote the tag wiki with octonions in mind, and phrased it "inclusively". A division-ring is surely always associative, but does that warrant having two tags? I think not. ...

4

Rename calibrations to calibrated-geometry. (Also a name such as (calibrations-differential-geometry) - or something similar - would help with clarifying the content of the tag. However, that seems to be unnecessarily long.) The tag calibrations was created in June 2019. This is the question where the tag was created: Calibrations vs. Riemannian holonomy. ...

4

Proposal: Remove the tag infinite-dimensional-space This tag was created by the question Are there such things as infinite-dimensional regular polytopes?, which is currently the only question with this tag. I don't see this tag having much utility. Update : The tag has been removed from the question, and should disappear soon.

4

Resolved. derangements is created. Proposal: create "derangements" tag I have a sense that the search bar doesn't serve very well for finding combinatorics problems about derangements. It's especially hard to search for very basic problems involving them, like the hat-check problem. Another question that seems relatively common is solving and relating ...

4

Proposal: Remove euler-mascheroni-constant. It's a duplicate of eulers-constant

3

The tag should be kept, but it requires a better description. After two years, this question has attracted 8 upvotes and no downvotes (which seems to indicate a moderate consensus towards keeping the tag orientation, I guess?). In the comments, it was suggested that the real issue might be that the tag description is unclear. Yet no one has come forward ...

3

Proposal: Rename graph-limits to graphons. I added a tag excerpt/wiki a few months ago to specify that this isn't just a tag for any limit that you graph, but I've edited the tag out of a lot of questions that used the tag as such. I think that renaming it would remove this tendency.

2

Proposal: Create the tag schur-functions. The Schur functions $s_\lambda$ are an important basis for $\mathrm{Sym}$, the graded vector space of symmetric functions, and they are very important in combinatorics. There are around 60 questions which can benefit from having this tag. Searching for "Schur functions" is:q returns 26 hits. Searching for &...

2

Proposal: add a tag for exponential families Rationale: I've asked at least a couple of questions now that I originally tagged with exponential-family, but each of these were edited to remove the tag. However, I think such a tag deserves to exist, because the concept of an exponential family is absolutely crucial to a number of topics in statistical ...

2

Proposal: rename the synonym "laplaces-equation" to "laplace-equation" or to ''laplace's-equation''. laplaces-equationis a synonym of harmonic-functions. I think we should have remove the s from laplaces-equation or give an Apostrophe before s (i.e., 's) . There is nothing called laplaces-equation rather we can called it laplace's-equation or simply "...

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