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Let us consider a formulation by Betrand Russell of Zenos Achilles and tortoise paradox. Achilles and the tortoise run a race in which the slow tortoise is allowed to start from a position that is ahead of Achilles' starting point. It is agreed that the race is to end when Achilles overtakes the tortoise. At each instant during the race Achilles and the toirtoise are at some point of their paths and neither is twice at the same point. Then, since they run for the same number of points, the tortoise runs through as many distinct points as does Achilles. On the dther hand, ii Achilles is to catch up with the tortoise, he must run through more points than the tortoise does since he has to travel a greater distance. Hence, Achines can never overtake the tortoise. Part of this argument is sound. We must agree that from the star of the race to the end the tortoise passes through as many points as Achilles does, because at each instant of time during which they run each occupies exactly position Hence there is a one-to-one coro pondence between the infinite set of points run through by thc infinite sct oi points run trough by Achilles. The assertion tha because he must travel a greater distance to win the race Achilles wil have to pass through points than the tortoise is correct. Wever, Because, as We know, the number Ol Points on the line Segmen
Achilles must Traverse to, the Race is the Same as musi
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