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Questions about mathematics which don't fall into the other arXiv categories. If you have a general question about mathematics but it is not research level, it's off-topic but it might be welcomed on Mathematics Stack Exchange.

5 votes

A set for which it is hard to determine whether or not it is countable.

The collection of all compact subsets of the real line up to homeomorphism
3 votes

Basic results with three or more hypotheses

Every compact, connected, locally connected metric space is the continuous image of the unit interval