An Einstein Problem
Suppose 1950 is the present, and physicist Albert Einstein secretly invented a time machine in 1949 shaped like a British telephone box and christened the “Time-Dial.” Whether the machine is stationary or not, as we will see shortly, is irrelevant. Presently, Einstein plans two trips into the past; his reasons for traveling are also irrelevant. The first trip is to exactly one year ago, after he first completed the Time-Dial, and the second is to 1550 A.D. We will ignore the other paradoxes involved in these voyages and focus solely on how double occupation results in neither of these trips o...
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Nahin, Paul J. Time Machines: Time Travel in Physics, Metaphysics, and Science Fiction. New York, NY: American Institute of Physics, 1993. Print.
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