Springer and the European Mathematical Society invite mathematicians to contribute to the recently launched Encyclopedia of Mathematics wiki. In this exciting collaborative endeavor, the 2002 online Encyclopaedia of Mathematics, containing 8,000 entries and illuminating nearly 50,000 notions in mathematics, has been transformed into a free access resource for the mathematics community.
All articles are managed by a prestigious and active editorial board, under management of the European Mathematical Society. New content and changes to existing articles will come under the most unlimited CC Share Alike License. MediaWiki software allows input directly in TeX or LaTeX. It uses MathJax extension, enabling what is currently the best possible display of mathematics online.
More information: http://www.encyclopediaofmath.org/index.php/Main_Page