I already know about Math Stack Exchange. I would like to know where else on the web one can ask and answer questions about mathematics at the university level. Websites need not be in English, but should have a reasonable level of traffic.
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There's a college sub-forum on artofproblemsolving.com that's reasonably active. – Potato Sep 30 '14 at 03:07
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Wikipedia Mathematics Reference Desk. – Lucian Sep 30 '14 at 03:18