Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
I like "coercive-functions"; that's the first tag I'd try searching for if I were posting a related question. When I taught this material a few years ago, I'm pretty sure the word "coercivity" never came out of my mouth.
"I want a solution to ..." seems actually a tiny bit more polite to me than the usual low-effort question we get, which is just a word-for-word copy of a homework problem, probably with a command like "Prove" somewhere in the middle.
@badjohn Of course, if I were a dishonest actor asked for the largest prime less than 2022, I would quickly check that 2021 is not prime and then change the number to last year's.
...First, I personally prefer to edit my own posts rather than other people editing them for me, and I think it's likely that someone who's written a great question feels the same way. Second, you might be wrong about where the OP got the question. I've had this happen when I recognized a past Putnam problem that ended up on someone's problem set. In this case, the source is less "context" and more "useful trivia", and this can change how the question is answered.
Things are more complicated when it's a borderline question in danger of being closed or deleted. But suppose it's a great question written by a problem you recognize. Should you edit to add the source? I think this is not a clear-cut no, but I personally would stick to a comment for two reasons...
Many of these problems have been used by PROMYS before, which doesn't work very well with the Math StackExchange policy. I mean, I'm against cheating. But there's a bit of a difference between "We wrote this problem, and don't want people to answer it in the next few weeks" and "This problem, which has been around on the internet and possibly discussed on MSE before, should be off-limits for the next few weeks."
People will use it that way unless there's a more specific tag, and possibly even if there is. (But I also don't think there's enough $_pF_q$ questions to justify a separate tag, and it's better to edit the current one's description.)
Even if 90% of questions with the word "limit" in the title are bad, that doesn't mean a filter for questions with the word "limit" in the title is useful - if almost all bad questions with limit in the title are downvoted immediately anyway, they won't be on HNQ, and filtering for "limit" will just prevent the 10% good questions from ending up there. Filtering makes sense if a disproportionate number of questions with "limit" in the title among those which are popular enough for HNQ are actually bad.
Aside from the main question of which pipe to use, rather than |-2| for $|-2|$ you should use |{-2}| for $|{-2}|$, solving the spacing issue. (Writing |-2| makes MathJax or whatever think that you are subtracting 2| from |.)
This is very worthwhile advice and I think the most worthwhile part of it is changing the title. If you're not interested in alternative answers to problem X, you should not put "how to solve X" in the title, but "what is wrong with this solution to X". If your question is called "how to solve X", you will naturally attract people who have a solution to X they want to share. (Maybe those people will then carefully read what you're asking, and maybe they won't.)
