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##### Guest

and also has a chance of planning the time he wants to go by making some calculations of classic physics. But if he wants to go to back, what must he do? the answer is travel above the speed of light, but i cant understand it, ok i agree the idea of travelling with that speed but can anyone explain me the mathematical proof of that? i had learned about modern physics in university and have a knowledge of mathematics and physics but i cant find a way to see the negative time travel with the formula above? if anyone interested in this problem, msg here and if wanna talk with details my icq no is : 18773750