What exactly is the problem with a flat, finite universe?(adsbygoogle = window.adsbygoogle || []).push({});

I've often heard it quoted that a flat universe must be infinite... but it's easy enough to design space-times that are perfectly flat yet are bounded. For example, S^1*S^1*S^1. What additional information is used to suggest a flat, finite universe is not feasible?

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# Flat vs finite universe

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