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If I have a maths question, on which site should I ask: MathOverflow or Mathematics.SE?
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.
research level mathematics
It depends on the question.
MathOverflow is for research level questions.
Mathematics.SE is for any level.