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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.

27 votes

Has any open/difficult problem in ordinary mathematics been solved only/mostly by appeal to ...

I suspect you'll get a pretty wide range of answers here. There are lots of examples of questions arising in not-set-theory that have turned out to be independent of ZFC. Here's another example that …