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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.
33
votes
Situations where “naturally occurring” mathematical objects behave very differently from “ty...
Almost all real numbers are uncomputable, yet almost every real number used in math is computable.
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Edit: Note that this does not meet all the criteria of the question, as clear explanations exist b …