If I have a maths question, on which site should I ask: MathOverflow or Mathematics.SE?
It depends on the question.
MathOverflow is for research level questions.
Mathematics.SE is for any level.
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I will add that more detailed explanation can be found in answers to Differences between mathoverflow and math.stackexchange. (Mathematics Meta) and How is this site different from Mathematics Stack Exchange? (MathOverflow Meta). – Martin May 6 '19 at 11:02
MathOverflow is a question and answer site for mathematicians. It's built and run by you as part of the Stack Exchange network of Q&A sites. With your help, we're working together to build a library of detailed answers to every question about research level mathematics.
– user178465 Jun 25 '13 at 12:51research level mathematics
? – Oded Jun 25 '13 at 12:53