Can someone explain how it was concluded by five users that "This question is not about mathematics"?
Quid's edit seemed to have disposed of the usual "close reasons", if they were valid for the first closing. But the question was closed a second time after that.
I would like to say that this was a strange and unique occurrence, but in fact it is common behavior on MSE.
Anyway, thanks to @quid for taking the initiative to forestall the closing of a question that is interesting in itself and has led to several thoughtful answers.