# Tag Info

100

No you are not required to follow up in comments. At the same time I feel it is not unexpected and rather normal that an asker tries to engage somebody that answered in case something is open. I feel it is strange to get upset about this, doubly so given the sketchy nature of your answer. If you do not want to further engage, say so clearly and neutrally ...

90

There are occasions when the use of l'Hopital is circular. E.g., when using l'H on $$\lim_{x\to0}{\sin x\over x}$$ you have to differentiate $\sin x$, but to differentiate $\sin x$, you have to evaluate $\lim_{x\to0}{\sin x\over x}$.

61

Avoid "no clue" questions Too many questions begin or end with "I don't even know how to begin with this problem". While this may be true (you may genuinely have no idea how to approach the problem), it is still not a valid reason to limit your post to the statement of the problem without any mention of your own thoughts. Such questions will most of the ...

48

I think the answer here is to be more selective in your questions. The site has to protect itself against getting bombed by low-grade questions from any particular user, hence the limit. (I'm not saying your questions are low-grade, I'm just making a case for the limit.) So only post a question if you feel that a good answer would really help you.

47

How can I choose the preferred website to put my questions? I once read something along the lines "If you have to ask whether to ask on MO or math.se, likely you should ask it on math.se." I think this is a good rule of thumb. What if someone writes his or her question down on the not preferable website? If you post on MO and they think it is ...

44

Please do your best to write this up using MathJax. This makes your post much more readable, searchable, and accessible. If you're worried about the process of formatting it in MathJax taking too much time, I would recommend breaking it up in to chunks and saving your draft on your computer in a text file (or email draft, or as a post in the sandbox for ...

43

Formatting and writing This is not some random internet forum. We strive for well-composed questions and answers of lasting value -- so keep in mind that your question can be of interest to others as well. Posing a well-formatted question Use proper English to the best of your ability The use of proper spelling, grammar and punctuation makes your ...

40

Personally, I'm against any calculus technique that can be applied without (much) thinking. These days calculus (in North America, at least) is taught in a way that people can get high grades without having the slightest idea of what a derivative or an integral is. In most classes I teach I ask what an integral is, and very rarely do I get satisfactory ...

37

TL;DR: the longer, the better. Based on the current data, longer questions tend to get a higher ratio of upvotes than shorter questions. There is not enough data to determine an 'optimal' question length. Full version I constructed a SEDE query which lets you play a bit with the interval length, and the maximum considered length. Feel free to fork it to play ...

36

I know what you mean, and I never could understand the sometimes outward hostility directed toward these individuals. I got the feeling that these folks were simply interested in challenging integrals, sums, what-have-you and they occasionally generated very intense discussions. I see a lot less of that lately and I think we are missing out a little by not ...

27

I do agree that sometimes higher reputation users are given greater leeway than lower reputation users. This is not just true with questions, but also "answers". This is unfortunate, but also somewhat understandable. If you have achieved, say, 10K reputation on the site, you have likely been active for a considerable amount of time, and have contributed a ...

27

Context is everything. When one of my students asks me "How can I solve question 1", I know what they are asking, I know what they were taught and what tools they have accessible to solving the question, and I may or may not recognize them personally and be able to size up their ability to approach the problem or their difficulties in doing so. When ...

27

You're not; your account triggered a warning for a ban that is no longer in effect (it has been superseded by rolling rate limits) - the ban itself was turned off but not the warning. There's another ban and another warning to go with it that are still in play, but you're far from qualifying for either. We're discussing how to best disable the obsolete ...

26

In general, it is considered poor practice to change a question drastically enough after an answer has been given. The person could have spent quite some time writing up a good answer, and if an edit invalidates it, that effort can be wasted. In this case, the effort clearly would not have been wasted - it would have helped you overcome part of your problem -...

26

Disclaimer: I hadn't seen your question before following the link in this meta question. I'm basing this answer on the first revision of the question. The title is the title, not the first sentence of the body. The question appeared to start (and still does) with a parenthentical sentence which is lacking context, and that's a bad first impression. This is ...

26

I want to amplify, perhaps a little more kindly, on @TonyK's "you're just being lazy" answer. Everyone answering your questions is volunteering their time, in trade for silly internet "reputation points", and perhaps for the satisfaction that they get from showing they know something, or the satisfaction of having helped someone, or ...

26

To answer the first question, the acronym (or some might prefer initialism) PSQ, is derived from Problem Statement Question. In its purest form it is a question post that only contains the statement of a problem, in a form that is frequently found in exercise sections of textbooks, assignments and alike, e.g.: Prove that $\sum_{i=1}^n i= \frac{n+n^2}{2}$ ...

25

I answer questions on math.se for several reasons. In roughly decreasing order of priority: To help researchers with problems they run into (especially those from fields outside pure math, whose mathematical problems have a chance of being at the level I can understand!) To teach the general public and curious independent learner. To help students who are ...

25

I have on occasion re-asked someone's deleted question, trying to ask it in such a way as to engage with the criticisms levelled at the deleted version, and being sure to state explicitly that I was re-asking a deleted question, and linking to that deleted question. So, I think it's OK to do it.

25

YES. Posting a question from elsewhere${}^1$ without reference could be considered plagiarism. While not illegal, it is considered to be very bad in academics. ${}^1$In particular, posting your homework problem without reference.

24

Let's call a spade a spade and admit that "show your work"/"what have you tried?" in the context of this site are primarily intended to be a less accusatory way to say "no, we will not do your homework for you". It is, of course, true enough that showing some work will also help answerers tailor their answers to the particular lack of understanding that the ...

24

The registration requirement had a big impact on the issues related to users losing access to their unregistered account (points 3,4,5 in the feature request). It is now a rare exception that a user needs to be told about merging their accounts. Before the change it was a common occurrence that a user posted a question from an unregistered account, later ...

22

c) Shouldn't we treat separately interesting PSQs that have an answer in books or are well-known folklore, and the average isolated homework PSQs in elementary linear algebra or calculus? Yes, we should (and most of the time, already do). Whether or not a question should be answered is not a matter of mere style of the person posting the question. The ...

22

In some circumstances questions like "How do I do X without Y" are genuinely intellectual exercises in working without powertools, but in other circumstances they seem more like "I have an aversion to thinking about Y so let's just do it another way." My impression is that the first group is by far the bigger group in general, but for l'Hopital's rule ...

22

This is largely an accessibility issue. Images are not searchable. Whatever you think of the quality of the built-in search engine, or external tools such as approach0, and their ability to find good matches for search terms, they do exponentially worse when the only information is given in image form. Relying on images to convey vital information makes ...

21

Buy, I guess none of you ever taught public high school or junior college. My week wasn't complete without someone threatening to go to the principal/head of department and threatening to have me fired. And now I'm tutoring online and that is a story of its own -- people demand you do their homework now, immediately, and give them the correct answers so ...

21

Posting the same question anew just to get more attention is not acceptable behavior. Please do not do this. If it is noticed your questions will be swiftly closed as a duplicate, likely it will also be downvoted and usually some users will complain. For acceptable ways to draw attention to existing questions see How to grab users' attention on an old ...

Only top voted, non community-wiki answers of a minimum length are eligible