I would like this question to be undeleted. It was voluntarily removed by the author although a correct answer was given. Given the OP's history on MSE, it seems the user asks questions, gets answers, and then deletes the questions. I do not think this should be permitted, as some user in the future may have the same question as the OP, but a valid answer will not be present due to a senseless deletion.
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replaced http://math.stackexchange.com/ with https://math.stackexchange.com/
Daniel W. Farlow
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