Mathematicians do have the capability to think of such things Oreo. If you really think about Time and Space, it is nothing but Math. It is nothing more than crunching numbers. A math professor would be more than able to do such things.
Actually Discovery Channel had a 4 hour mini-series with Stephen Hawking not long ago. He talked about time-travel and gave reasons why it wouldnt be possible. Such as the paradox effect. That is just 1 of about 5 reasons he gave in his explination. It was a great watch. If it wasnt like $60 for those 4 hours i would get it.