# Tag Info

6

There are likely two non-related issues: The answer you gave uses a development of $\tan(x)$, at least initially without much comment, which is in a way stronger than what is asked in the question. Thus, the reasoning feels a bit circular. This is a general problem with these types of questions (not the answers), it is often not made clear what is used as ...

2

It's a review audit , to see if your review skills align with the review skills of others. It also tests a reviewers knowledge of site policy. Congratulations are not warnings, despite that use in everyday society for things like pregnancy etc. Addendum you can simply click next.

1

Computer searches are a part of modern mathematics. It is natural for people to ask about them. Much of math research is about finding patterns and making conjectures. In addition, some of the questions in the OP could be solved without computer searches, for example Consecutive sequences of not cube-free numbers which could be solved nicely with the ...

13

Some people wondered about the same question also on Meta Stack Exchange: What's going on with the Announcer badge?, Suddenly getting “Announcer” badges every few minutes? Recently, some bug was fixed in the procedure that calculated number of visits for purposes of the publicity badges (Announcer, Booster, Publicist). More details are available here: ...

4

Like most math problems. That's what they are. You can compute asymptotics of the code you create etc. The first problem listed, is equivalent to asking if:$$\binom{9n}{n}\cdot\binom{8n}{n}\cdot\binom{7n}{n}\cdot\binom{6n}{n}\cdot\binom{5n}{n}\cdot\binom{4n}{n}\cdot\binom{3n}{n}\cdot\binom{2n}{n}\cdot (n!)^9+n!+1$$ can be prime. Which is quite the ...

27

Generally it is alright to use language that otherwise would seem vulgar or offensive if it is established/technical usage, for example Stack Overflow has an entire tag brainfuck, because somebody thought it was a good name for a programming language. Things to keep in mind: Make it amply clear that this is established usage. Rather avoid to put such ...

9

We should keep these problems, because you never know when you have one. Some days ago, user Nikita asked the question Is this contrived sequence eventually periodic?. Innocently enough, they explained that they had built quite a weird sequence $A(n)$, which seemed to have a period, as all residue classes mod $6$ except for one gave the exact same thing. I ...

2

Reasons it is unlikely to be looked at favorably: It spaces lines out way more than required ( and can create typographical widows) It can usually be replaced altogether with something that will fit inline ( like $x_n+\cdots+x_1$) Making it tinier to avoid using inline math, just makes it hard to read ${\tiny{\displaystyle\sum_x^y}}$ for example. You didn'...

22

No. $\displaystyle\sum_{x}^{y}$ is not an improvement over $\sum_{x}^{y}$. Display style mathematics should be used in displays, and in a diminishingly small number of other circumstances. Display style math in an inline context stretches the vertical space on that line (which makes the line spacing inconsistent; see above), and is generally considered ...

9

This was linked from the closure notification. What topics can I ask about here? Mathematics Stack Exchange is for people studying mathematics at any level and professionals in related fields. We welcome questions about: Understanding mathematical concepts and theorems. Mathematical problems such as one might come across in a course or ...

3

Reopened Please consider voting to reopen this question: Peak response of second order system with rectangular pulse input The OP has improved it a lot.

0

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.

4

Undeleted Please consider undeleting this question. It is a nice instructive problem about a topic that deserves to be much better known and often proves troubling for students - namely Kronecker's ideas relating the factorization of polynomials to the factorization of their values. Because these ideas are so little known I can understand why the author ...

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. ...

7

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 ...

4

Drawbacks of using MathJaX I can figure are: MathJaX can possibly fail with Javascript disabled ( as it's an AJAX ( Asynchronous Javascript And XML) library emulating LaTeX) which loses the effect. Markdown doesn't take a menu to copy a phrase from. It might be confused for actual math content, on a math website. The word or phrase, won't necessarily be ...

12

Use mathjax for mathematics, not for text formatting. The mathjax italics happen because mathjax thinks "abcde" is just a string of variables.

3

Here's another not-quite-an-answer to complement the not-quite-an-answer of @EthanBolker. Sometimes I write an answer like he does. But there are plenty of other times that I start to write such an answer, and then get annoyed as the answer gets longer because I realize that I might well be wasting my time writing an answer that could turn out to be ...

8

Not quite an answer, but perhaps helpful. When I see a question like this one where I suspect that the OP does not quite know how to phrase what they want to know I try to guess. Then I answer this way: I think what you are asking is [rephrased/expanded question]. If so, then [possible answer]. Then the OP (or others) can agree or disagree and vote as ...

5

Disclaimer: my grasp of differential/Riemannian geometry is not quite strong enough to answer your underlying question, but I think I understand all the various pieces enough to answer this question on meta. First off: What is "Fact or Fiction?" doing in the question title? It comes across as click-baity and adds nothing to the actual question, which ...

9

The size directives \large etc. are not commands taking arguments. Their effect lasts until the scope(1) in which they were issued ends. The same holds for style selectors like \displaystyle, \scriptscriptstyle and so on. Thus wrapping G(x_1, \dotsc, x_n) in braces doesn't make it an argument to \large, it just makes the expression an ordinary maths atom (...

-3

Proposal: create tag "inverse-fourier" I think there should be a tag named inverse-fourier which represents mainly the inverse fourier transform. I know there is a tag named fourier-transform but inverse fourier transform is also an important area of research. It has many application too. I want a suitable discussion about that. If everything goes alright, ...

0

Proposal: rename eulerian-path to euler-trail First off, a walk that traverses every edge of a graph is generally not a path but a trail. Second, when this situation occurs, it is the graph that is described as Eulerian and not the walk (at least IME). While I'm here, I may as well add that the tag is used to discuss Euler circuits (not to be confused ...

2

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.

6

Mentioning the series is fine. Most people just mention the series, but the reason they get downvoted or closed is usually that their questions don't show effort, and so it gets flagged as missing context. Your question clearly shows effort, so it wouldn't be closed.

1

Reopened I asked a question yesterday: Coupon collector's problem: mean and variance in number of coupons to be collected to complete a set This asks for the mean and variance of the coupon collector's problem in the general case when the coupons have unequal probability. It has been marked as a duplicate of this one: Expected time to roll all 1 ...

0

This question gives space to another scenario the currently accepted answer isn't considering. What if my question was marked as duplicate and I disagree with it? In this specific case, I suggest you to write a comment or edit the question explaining what is different from your question and the other one and then vote to reopen. As a reviewer of Reopen ...

15

The community can be fickle sometimes. Especially with questions that aren't very detailed, folks can get protective of their notions of what the poster is actually looking for. I focused on "What does $0\neq1$ mean?" while you focused on "How is it related to addition and multiplication?" Looking back on it, the real question should have been "Why would ...

6

Every user with 10k+ reputation can vote to delete closed questions, and undelete deleted questions. There is essentially no restriction on that. Unlike close/open votes, the same users can cast delete/undelete votes as many times as they like on the same post. So it is not uncommon to see delete/undelete wars. I think most users believe that good content ...

-2

I posted a duplicate of this question, and then a version in which I propose an answer. It was suggested (in comments to one of the answers here) that I post an answer here. I just copy some of the points I made in my question Progressive deduction in rep for downvoting. Proposal: A downvoter would not lose rep if they cast only one downvote per day. Any ...

1

To my knowledge, the change doesn't affect the auto-delete feature (aka "roomba"). So in this context, one upvote doesn't cancel out 2.5 5 downvotes. See: Enable automatic deletion of old, unanswered, zero-score questions after a year? I asked on meta.SE if it affects question bans, and I was informed it doesn't affect those either.

11

My understanding is that the cost of downvoting is there not so much to discourage serial downvoting as to discourage casual downvoting. It makes you think twice about whether you really want to downvote (at any rate, if the points are important to you). If your pride is hurt by losing a point, think of how it hurts to have your answer downvoted. If the ...

5

Some examples of incorrect possessive: Stoke's theorem (incorrect) should be Stokes' or even Stokes's since the man's name is "Stokes". Similar: Baye's theorem (incorrect), which appeared somewhere in .se recently.

11

For fun: How can I make \ appear in MathJax? The command \cancel produces a forward slash: $\require{cancel}\cancel{\phantom{k}}$. A simple rotation flips it around to produce a backslash. So \require{cancel} L(A)\!\!\! \style{display: inline-block; transform: rotate(90deg)}{\cancel{\phantom{mm}}} \!\!\! L(B) gives $$\require{cancel}L(A)\!\!\! \... 21 Here's a list of possible solutions that I could come up with (includes a curated Detexify output), the first two are the other two current answers: L(A)\backslash L(B) L(A)\backslash L(B) L(A)\setminus L(B)$$L(A)\setminus L(B)$(looks the same as the next too)$L(A)\mathbin{\setminus}L(B)L(A)\mathbin{\backslash}L(B) L(A)⧵L(B) L(A)⧵L(B)$using ... 20 If you want a real backslash, and not something spaced like a binary operation, use L(A)\backslash L(B) to get $$L(A) \backslash L(B)$$ 26 Use \setminus for the result$𝐿(𝐴)\setminus𝐿(𝐵)\$.

4

Your question is marked as duplicate, but this might not be the reason why you are getting a down-vote. As pointed out in the comment, you have a net gain of reputation point, so in terms of reputation points, you are not being punished. Yes you cannot delete your post, not because it is marked as duplicate. You cannot do that since there are upvoted ...

0

I agree with your statement to some extent, but (paraphrasing one of your answers you linked to) I think it takes an extreme position that I believe would be harmful. It would mean that hardly any posts mentioning humans would be allowed at all. For example, take this recent tweet (I replaced 'mathematicians' by 'guests' - see comments): At a large ...

3

Undeleted The following answer was deleted: https://math.stackexchange.com/a/1409573/10513 and I believe it should be undeleted. The question is rather old (2013). The context of the question is that they are reading a research article which states a result, and the question is asking for a proof of this. Each of the other answers gives a citation rather ...

20

Here are some words which have been misspelled in some posts on the site: alegbra; search, SEDE analisis; search, SEDE analyis; search, SEDE ananlysis; search, SEDE asyptotic; search, SEDE Banch; search, SEDE biyective; search, SEDE boudary; search, SEDE caracteristic; search, SEDE cateory; search, SEDE Caley; search, SEDE Cauchy+Swartz; search, SEDE ...

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 ...

0

Please consider undeleting this post: Does the law of cosines contradict Pythagoras's theorem? It has been recently mentioned by Martin Sleziak in the CRUDE chat room and a user by GENTLE. As Henning Makholm's comment under the deleted post mentioned, "... the asker is wrong, but he's presenting his wrongness clearly in a way that makes it possible to ...

26

This is probably closer to a comment, but it would be too long. I suppose that you got the number above 30000 by searching for occurence on the main site. This is an overestimate - I do not know the exact details of how the search engine of Stack Exchange works, but apparently it tries to include words which are close to the one you're searching. You can ...

-6

I am the person you are complaining about. I do it out of spite, mostly. I read the question, and if it is truly an awful question like "Do my homework for me" type, I'll let the down-vote stand. Otherwise I up-vote and chuckle a little because I know it's going to make someone grumpy. Good to know it's working. There is another reason, besides ...

4

There are two commonly observed ways to deal with "PSQs", Problem Statement Questions, that is homework-looking questions where no context or personal thoughts are provided: one of them is to answer them (either because you're rep farming, or for whatever reason you feel like answering) the other is to close them for lack of content and/or downvote. This ...

23

It is not exactly clear to me what type of answer you are looking for, but for what it's worth: Yes, as far as reputation points are concerned the relative impact of downvotes on questions is reduced; now five downvotes cancel one upvote while formerly they canceled two, as the deduction of two points per downvote was not changed. This is "by design" ...

0

Proposal: Hyphenatecrossedproducts. Reason: Hyphenation improves readability, and is standard practice.

10

I agree that these tags are not needed. For the former I suggest to retag the two questions (the tag then goes automatically away after a day). For the latter we might wait for a few days if the question "survives" or not. If the questions should be deleted the tag would be gone too. For tags that only have a few questions to them, retagging is usually ...

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