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contains information about the group, membership, projects, and databases.
http://www.emis.de/
http://www.gctm.org/
founded in order to promote research in mathematical physics.
http://www.iamp.org/
considers and publishes class-tested, web-based learning materials.
http://www.joma.org/
The Mathematical Association of America is the largest professional society of college and university mathematics teachers in the world. Mission: To advance the mathematical sciences, especially at the collegiate level.
http://www.maa.org/
http://www.nctm.org/