I posted a question on MSE for two months and received no helpful answer. So I tried the same question on MO. I got 4 off-topic votes and so the question got migrated back to MSE. I'd like to mention that I actually got some upvotes before others downvoted it. So I'm wondering What on earth is an off-topic on MO? This is vaguely defined in MO's help center, as I quote:
(on-topic) to ask and answer research level math questions, the sorts of questions you come across when you're writing or reading articles or graduate level books.
Although I did not ask a particular question from graduate level books, I certainly have already resorted to several before I asked the question--I didn't find a satisfying answer. Otherwise, why would I ask the question in the first place?