# Tag Info

17

Maybe for the street person there is no difference but from the point of view of the mathematics involved there is a wide gap between these two tags. My answer is similar to hejseb's answer but I wanted to add more detail: Finance tag is likely to attract questions related to applications of stochastic calculus and stochastic partial differential equations. ...

16

I suggest that we adopt the convention that $F_0=0$ for both the tag wiki and summary, with a possible note in the wiki that $F_0=1$ is occasionally used as well. Why? This is consistent with OEIS A000045 and it results in a nice form of Binet's formula (as opposed to a offset in the exponents). Other properties (as mentioned in the comments) rely on a ...

14

WillieWong wishes me to pass on this message: (he can't post it himself right now) Concerning the two tags physics and math-physics, I merged them a long time ago, but undid the merge at the request of the user t.b.. The justification is that there are two types of mathematical problems concerning physics, one is questions strictly about mathematics which ...

13

I consider the tag even-and-odd-extensions too specific to be really useful. (Having too specific tags applicable only to very narrow class of questions can cause problem since there are only five spots available for tags.) My suggestion is to create a new tag even-and-odd-functions. This tag is at least slightly more general. It might be potentially useful,...

11

I agree with Andres, along with the many examples posted in the comments. The axiom of choice might be dealt with naively in some contexts, and those questions elicit the elementary tag. For example "How to use the axiom of choice to prove that every function has an injective inverse?" But on the other hand, there are questions on the site related to the ...

11

In practice they're totally different things. Finance's concerns are generally narrow, short-term, and quantitative, while economics is generally concerned with broad, long-term, and qualitative problems. Of course that's a massive oversimplification, but I don't think anyone would confuse the two areas.

11

I'd suggest closing as duplicate with a generic Q/A, which makes clear that any continuation is possible shows how to find continuations for simple cases (e.g., method of repeated diffferences for polynomial sequences) informs how look for sequences on OEIS.org

11

It is not possible to have two tags with the same name. There are a few options to work around such things. For example we have divisors-algebraic-geometry to signal what type of divisors we mean. One can also group things together to disambiguate, for example "divisors-and-multiples" would convey what divisors are meant as well. For the current ...

10

I don't expect that we shall ever know why the word "compact" appeared in the excerpt. It's almost exactly five years since the creation of the tag wiki excerpt (the tag wiki itself was however only created last year), and even if it was deliberate, I doubt the creator would still know the reason. Anyway, I went ahead and edited the excerpt.

9

Current SE philosophy about suggested edits suggests that they need not be rejected out of hand. While once upon a time there was a "too minor" reject reason in the suggested edits review queue, this is no longer the case: The closest reject reason would be "no improvement whatsoever", but this should only be used when there is no improvement whatsoever ...

9

At least the questions linked in the OP seem to be about relating values of the function (or its derivatives) at different points of the domain in each instance of the equation. I think this ought to be enough to make the functional-equations tag apply to the questions, even if the equation also involves derivatives. A priori, solving them they might need a ...

8

I think both of them are needed. Browse through the questions and you'll probably see that they are a little different. For example, in the finance tag you have (or should have!) lots of questions about the pricing of financial assets (annuities, compound interest calculations, different asset pricing formulas such as Black-Scholes etc). In the economics ...

8

The vast majority of these questions is indeed off-topic. Their closing should continue. However, doing this with appropriate explanation (e.g. pointing to Puzzling.SE) can become tedious. On the other hand, a migration path is not going to happen as long as Puzzling is in beta, given earlier discussion about this (as linked to by Martin Sleziak). Moreover, ...

7

Every tag has an info page that you can get to by clicking on the tag name. Such as this one: calculus. You will be taken to a page that looks like this (If the tag doesn't have information the page displayed will be slightly different.) Simply clicking on "improve tag info" will bring up the editor and allow you to suggest an edit to the tag excerpt (a ...

7

A user gets privilege to edit tag-info (without having to go through review) only at 20k reputation points. It seems logical that only users with edit privileges get possibility to "improve edit" or "reject and edit". Here is a screenshot to show that at higher reputation these options are indeed offered: See also related posts on Meta Stack Exchange: ...

7

The following old bug report on Meta SE seems to be identical to what you observed: Activity log entry before registration date. Though that report is marked status-completed, it seems that there is a regression of this bug on at least two other SE sites: Anime & Manga SE: According to the activity tab of my profile, I performed some actions on a site ...

6

A proposed tag wiki excerpt based on user1729's comments above: Questions about the details of implementing an $\epsilon$-$\delta$ proof, which typically appears in the context of analysis; for example about how the appropriate $\delta$ can be chosen for a given $\epsilon$. A proposed tag wiki: In mathematical analysis one often encounter statements of ...

6

Martin Sleziak created a tag wiki and excerpt, based on the comment by Git Gud, who originally introduced the tag (as proposed in this post). Currently the description reads: For questions about proofs within a formal system, such as natural deduction or Hilbert system. Judging from the comments, the current interpretation appears to be: Yes, the tag is ...

6

People should not be searching for/favoriting/subscribing to "functional-equations" to look for Differential Equations. I agree with the Phira's position in the question.

6

Edit: I have made the change described below. https://math.stackexchange.com/tags/coding-theory/info To summarize the suggestions in your post and the comments, I suggest we change the excerpt as follows. Use this tag for questions about source-coding and channel-coding in information theory, error-correcting codes, error-detecting codes, and related ...

5

I think that: The tag elementary-number-theory should not be a subset of number-theory, the later should be reserved for more advanced stuff. My impression is that these two tags have been used in this way historically. (This is also what the current revisions of the tag-wikis say.) I don't think that going through 10k+ questions and retag them manually ...

5

I think the obvious problem is that elementary-number-theory seems, semantically, like it ought to be a proper subset of number-theory. Therefore, users posting elementary questions naturally think they should use both tags. Experienced users who are doing serious business number theory often know how the tags should be used, because they read the tag ...

5

There is a limit of 25 characters for the length of tag names, and the hyphens count. The proper name moment-generating-functions is two characters too long, so two characters were dropped in such a manner that the tag name is still understandable. The character limit was increased, so it was possible to create the tag with the proper name. moment-...

5

Most information about MSE can be found through the Help Center, which can be accessed from the navbar at the top of the site: The Help Center has a section labeled "Privileges". Click on the only link in that section to find a list of privileges which are earned at various levels of XP. This list is clickable. Clicking on the link for 5,000 XP ...

5

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

I think 2-groups-higher-categories and n-groups-higher-categories would clearly signal what they were talking about. I'm not sure anyone is asking questions about these, though.

5

You are right, this is part of some recent network-wide changes to the profile: Now live: A fully responsive profile. Some of the reasons for the changes are in other posts on Meta Stack Exchange, e.g. Some changes to the profile while we make it responsive. The top network posts were listed in the previous version of the profile as well, but right under the ...

4

It was recently mentioned in chat that the tag-info for the tag catastrophic-cancellation consists basically only of a few links. I have tried to improve it at least a bit, but it would be probably better if somebody who knows more about numerical mathematics had a look at the tag-info. (And there is also a separate question whether this tag is actually ...

4

I would say that Finance focuses on the study of assets traded on financial markets, whereas Economics is concerned with ALL markets (financial markets, labor market, markets for goods...)

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