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21h
comment Let $f(x)$ be a function that satisfies $f(f'(x))=3xf(x) \iff x\in \Bbb{A}$. Find $f(x)$.
You've asked about why this was closed as off-topic. That can sometimes be a hard question to answer. In this case, it's likely a reaction against the tone of your question. It sounds like you came across a homework/exam question and want MSE to do it for you. You also have given no context. What sort of exam? What class? What did you try? What other things have you learned? Do you know things about functional equations? About contest-mathetics? Or about calculus? This is my conjecture - I'm not sure. And I didn't close it. For more, you might read the on-hold reasoning at the bottom.
21h
comment Creating limacon in Tikz help?
While this is a better fit for TeX - LaTeX, I am not migrating it there because as currently written, this question is of too low a quality to migrate. We only migrate questions that we believe will be well-received at the destination site. If the OP reads this, I encourage you to look into this a bit more. Then, if you still have a question, ask it on tex.se along with what you've tried, what you've read, and what went wrong with your expectations.
22h
comment Remarkable mathematics in the The Simpsons television show
I've removed some of the comments here. Please keep comments on topic. Use the associated meta thread to talk about meta concepts.
May
26
awarded  Good Answer
May
26
comment Understanding derivatives
If you'll forgive the self reference, I once wrote a post about some of the major ideas in calculus that you might find instructive.
May
25
awarded  Nice Answer
May
23
revised Question regarding a loan from a bank for my friend
added 11 characters in body; edited tags
May
23
comment What is $\gcd(\sigma(q^{k-1}), \sigma(q^k))$?
Arnie, I encourage you to rewrite your question to be just the question. Then write your answer as an answer, accept it (because it's correct) and we can upvote you and be happy. If you're reputation concious, you can make your answer Community Wiki if you really want.
May
23
answered How many three digit numbers with increasing digits can be formed from the set $\{1, 2, 3, 4, 5, 6, 7, 8\}$?
May
22
comment Identification of a quadrilateral as a trapezoid, rectangle, or square
@yes nice title change,
May
22
revised Proving that $p^{\alpha + \beta + 1} \mid {n \choose k} p^{k\alpha}$ when $p^\beta \mid n$.
meaningful title
May
21
revised Cardinality of Two Sets
edited tags
May
21
revised How can I solve $4x + 51y = 9$ using congruences?
meaningful title, minor tag change
May
21
awarded  Good Answer
May
21
answered Question regarding specific limits
May
21
awarded  Enlightened
May
21
awarded  Nice Answer
May
21
comment Getting rid of weights after using smoothed versions of Perron's formula
It's not really routine at all. The short answer is that you pull out your algebra chops and give it all you've got. For instance, instead of doing the transform you've done, I find it easier to use $X^s / (s(s-1))$, which gives the same convergence properties but weights the series like $a_n (1 - n/X)$, which you then just expand out and work with. But morally, extremely difficult problems come from trying to unweight weighted sums.
May
20
answered How to force prime numbers into a line?
May
20
revised Prove that $12 \mid m \iff$ both $6 \mid m$ and $4 \mid m$.
edited tags; edited title