Useful mathematical fora
Solution 1:
English language
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Of course, there is mathoverflow, many users of this site are active there too. google: mathoverflow site:math.stackexchange.com
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sci.math, Usenet group, google: "sci.math" site:stackexchange.com
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AoPS - Art of Problem Solving, phpBB, supports TeX using LatexRender, google: artofproblemsolving site:stackexchange.com
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MHF - mathhelpforum, supports TeX, google: mathhelpforum site:stackexchange.com
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mymathforum, phpBB, suports TeX, google: mymathforum site:stackexchange.com
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Physics Forums - Sub-forum Mathematics, google: physicsforums site:math.stackexchange.com
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S.O.S. Mathematics CyberBoard, phpBB, supports TeX using LatexRender, google: sosmath site:stackexchange.com
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Topology Q+A Board, google: "yorku.ca" site:stackexchange.com
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Free Math Help, google: "freemathhelp.com" site:stackexchange.com
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Math Help Boards, google: "mathhelpboards.com" site:stackexchange.com
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Tetration forum(about) and Forum itself (moderated, all levels,phpBB,TeX), google: tetrationforum site:stackexchange.com
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Mathematics subforum of xkcd; phpBB; supports LaTeX using jsMath - but they prefer avoiding it where possible, so that the site is not slowed down, see here; google: "fora.xkcd.com" site:stackexchange.comThis forum no longer exists. -
Abstract and Linear Algebra. , Google: "math.miami.edu/forum" site:stackexchange.com
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Purplemath, phpBB, supports LaTeX; Google: "purplemath.com" site:stackexchange.com
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Wikipedia Reference desk Mathematics
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Integrals and Series, users communicate in TeX while the interface does NOT render.
German language
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de.sci.mathematik, Usenet group
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Matroids Matheplanet, supports LaTeX
Czech language
- Matematické Fórum at matematika.cz (formerly matweb.cz); supports TeX
Italian language
- Matematicamente.it/forum, phpBB, supports LaTeX using MathJax; Google: matematicamente.it/forum site:stackexchange.com. The forum also has an English language section (called English Corner).
Russian language
- dxdy, phpBB, supports LaTeX.