I want to ask about various mathematical fora and discussion boards available online. I think it might be useful to have such a list here at Math.SE.

If I may suggest, it could be useful to keep one long list with basic information as a community wiki, and if you want add some additional information on some of them, a separate answer might be the best way. (E.g. information like: "this forum is particularly suitable for questions about contest math" or "this forum is frequented by specialists in computer algebra, most discussions are about CAS software such as GAP", etc.)

In particular, if you deem some of other fora more suitable for some kind of questions than math.SE, this would probably be an interesting information for users of this site.

A related question: Which discussion board is good for homework questions?

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    $\begingroup$ My instinct would suggest that this kind of a list would be better placed in Meta, but let's see how others feel about that. Before I found this place, I was active in the math section of fora.xkcd.com. It isn't nearly as useful or active as this place, and also it is a tad too "chatty". But (being moderated) better than, say, the troll-infested usenet group sci.math. $\endgroup$ – Jyrki Lahtonen Aug 26 '12 at 10:20
  • $\begingroup$ @Jyrki I've added that forum to the list. Since you are familiar with the forum, you could perhaps check, whether the information I've given there is correct. $\endgroup$ – Martin Sleziak Oct 27 '12 at 7:34
  • $\begingroup$ Somewhat related question on MathOverflow meta: Any other site besides mathoverflow and mathematics stackexchange? $\endgroup$ – Martin Sleziak Dec 4 '16 at 7:52

English language

German language

Czech language

Italian language

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    $\begingroup$ I've included links to google searches in some places; I think it might be interesting to see, whether these fora are often mentioned in math.SE posts. $\endgroup$ – Martin Sleziak Jan 2 '12 at 12:28

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