I recently asked this question. Immediately there were votes cast to close it and it several people downvoted it (although some also voted it up).
But these questions were wildly successful generating lots of nice answers" and stayed open for a long time.
Why are people so "trigger happy" to close my question? It seems somewhat unfair, in comparison to the fact that these other questions stayed open for month.
I believe, as it is along the same lines as these other questions, but fills a void these questions haven't covered, it might also attract nice answers from knowledgeable people, so by closing it some nice answers might be lost to the math.SE network! And why would you want to do that?