Look at the question on Ito's lemma which has been closed with only two close votes. I believe that it is a valid question - while this type of question would probably be closed on MathOverflow, it wouldn't be closed on StackOverflow. I believe that moderators should only use their power to close questions with a single vote on questions which there is broad community agreement that the question should be closed. I don't believe that this question falls into that category.
I don't want to focus on the specific problem, but whether these types of questions should be closed by moderators using their single vote power or not.