# Tag Info

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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 ...

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Resolved: fixedpoints renamed to fixed-points. For consistency with other multiple-word tags. Separating words with hyphens increases readability.

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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-...

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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 ...

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Resolved: euler-method has been merged into eulers-method, a synonym created, and tag wiki updated. Proposal: synonymize euler-method with eulers-method Notice that they are indeed different tags, as the former has user guidance, the latter doesn't. But they are essentially the same thing, i.e. a numerical method to solve first-order first-degree ...

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Resolved (mostly) Creation of a tag gcd-and-lcm. Merge of the GCD part, not yet merged the LCM part, in case some objection emerges. The tag wiki might need some (more) attention. Proposal: merge gcd and lcm We tend to combine homologus objects into one tag, like supremum-and-infimum, limsup-and-liminf and even-and-odd-functions. It's well known that $ab ... 10 Resolved: The tag synonym was created. I suggest a synonym dg-algebras$\to$differential-graded-algebras. The tag (dg-algebras) was created in July 2017 (shortly before allowed length of tag names was increased). A short tag-excerpt was also created at the time. The tag (differential-graded-algebras) was created recently (July 2019). It seems clear that ... 10 So far it seems from the votes and comments lean towards separating dimension theory in analysis/topology from dimension theory in algebra. Let me just add one additional suggestion. Suggestion. Do not put questions about dimension theory in linear algebra under the same tag as dimension of rings/modules. Whether or not a tag for dimension in the sense of ... 9 Having posted the linked meta answer in the comments, perhaps I can give an answer. As @ArcticChar has mentioned, it's a convention to pluralize tags if possible, like cubic-equations, definite-integrals, etc. In such case, the tag name is used to refer to multiple objects of a category, instead of a single one. For example, definite-integrals is used for ... 9 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? 8 Proposal to remove (or even blacklist) significance It is a meta tag and it is a bad one. I sincerely ask the creator to stop retagging old questions until we have an actual discussion. 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: make smooth-manifolds a synonym of manifolds. In theory, there is a distinction between these tags, with smooth-manifolds referring to just differentiable manifolds and manifolds also including topological manifolds. In practice, the distinction does not matter for many questions and manifolds alone is very frequently used for questions that are ... 7 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 ... 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 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 My own area of research is fractal geometry. In fractal geometry, there are various notions of dimension (Hausdorff, box, Minkowski, Assouad, packing, complex etc.). Very roughly speaking, the dimension of a set in a metric space describes how the "volume" of a set scales when the set is scaled, where "volume" may be in terms of a measure (e.g. in the case ... 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 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 rather ... 5 Proposal: Create tag "squarefree" and its related tag info I was surprised to find that we don't have a "squarefree" tag. There are about 350 Questions on Math.SE that mention "squarefree" (and about three times that many if all posts are included). Among other advantages, a tag would provide the wikia summary of basic ideas for this topic in number ... 5 Resolved. semisimple-lie-algebras is created. Proposal: Create "semisimple-lie-algebras" tag Semisimple lie algebras is an important class of Lie algebras, and we already have tag semi-simple-rings. 5 Proposal: create "linear-fractional-transformation", and synonymize with lft and mobius-transformation. They refer to the same thing in most basic cases. Tag lft is really hard to notice its exsitence, and it only has 16 questions for almost 6 years. Here's some discussion about this. 5 Proposal: I suggest to create a synonym between matrix-groups and linear-groups. (I am not really sure which direction is better.) The tag linear-groups has been on the site for some time, you can see that the tag-excerpt and the tag-wiki have been created in 2013. The tag matrix-group has been created recently (July 2019). As far as I can tell, the two ... 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 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$", separate from "exponential-function", having the synonym "... 4 Proposal: Tag suggestion: cyclic-symmetric-sums See Tag suggestion: (cyclic-symmetric-sums). 4 Resolved. derangements is created. Proposal: create "derangements" tag I have a sense that the search bar doesn't serve very well for finding combinatorics problems about derangements. It's especially hard to search for very basic problems involving them, like the hat-check problem. Another question that seems relatively common is solving and relating ... 4 Proposal: Remove the tag infinite-dimensional-space This tag was created by the question Are there such things as infinite-dimensional regular polytopes?, which is currently the only question with this tag. I don't see this tag having much utility. Update : The tag has been removed from the question, and should disappear soon. 3 I would change "We often require that..." to simply "Often" but otherwise this looks like an improvement to me. Certainly the current phrase "intrinsic qualitative aspects of invariant spatial objects under homeomorphic transformations" is terrible. For what it's worth, tag wikis are not very important--they are obscure, hard to find, and not read often (... 3 Resolved: the tag is removed from that one question. Please consider removing the tag 4d. It is a new tag and has only one question, which is about cube in 4d. On one hand, it is definitely not necessary to have the tag$nd$for all$n\in \mathbb N$. More importantly, four dimensional manifold has a special role in differential geometry, so the tag$4d\$, ...

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