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Javelin argument


The javelin argument is an ancient logical argument in support of the cosmological idea that space, or the universe, must be infinite:

This argument was used to support the Epicurean thesis about the universe.

However, the argument assumes incorrectly that a finite universe must necessarily have a "limit" or edge. The argument fails in the case that the universe might be shaped like the surface of a hypersphere or torus. (Consider a similar fallacious argument that the Earth's surface must be infinite in area: because otherwise one could go to the Earth's edge and throw a javelin, proving that the Earth's surface continued wherever the javelin hit the ground.)


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