- Yahoo Groups: Math For Fun - Focuses on solving challenging math problems.
- Talk Math - A discussion forum for students and teachers. Topics discussed include Algebra, College Algebra, Calculus, Trigonometry, Geometry.
- Yahoo Groups in Mathematics - Mailing lists and discussion groups (including former OneList and eGroups).
- Topica: Science/Mathematics - Mathematics-related e-mail lists.
- Yahoo Groups : Erdos - A group for proposing problems, sharing ideas, discussing areas of research and reviewing papers and books of interest. [Requires Yahoo! membership]
- Yahoo Groups : maththeorists - Discussions relating to number and mathematics philosophy.
- Maths is Toothpaste - Mathematics is useless on its own, it only has a function when used with something else (i.e. a toothbrush). An online discussion.
- Yahoo Groups: Theory-edge - Informal discussion of research in algorithmics, mathematics, and their applications.
- Mathstore Electronic Discussions - A list of mailing lists compiled by LTSN.
- Maths-Education - Email forum for those working in mathematics education to share ideas and experiences, and request information.
- Javamath-discuss - A general mailing list for discussion about mathematical software development in Java.
- WebMath - A mailing list for those interested in mathematics on the World Wide Web.
- JISCmail - Mailing lists in mathematics and statistics for the UK academic community.
- Undernet Math - Topica email list serving the users of the IRC channel
- Mathforge - News and breakthroughs in the mathematical sciences, including software, education and books.
- Math Forum: Public Discussions - Group topics include general math, education, geometry, software, calculus reform, research and recreations.
- Math is Fun Forum - A discussion forum for K-12 math students and teachers, with a focus on learning and teaching math the fun way.
- The CTK Exchange Forums - Discussions on elementary, middle and high school mathematics and mathematics education.
- Math Help Forum - A discussion forum for students and teachers of mathematics at school, college and advanced levels, including homework help for students.
- Ars Mathematica - News and discussions on the mathematical arts.
- The Everything Math Forum - Help and discussions about mathematics and philosophy, with problems of the week.
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