MathML Technologies in the Xmath e-Learning Project Enrique Canessa (ICTP, Trieste, Italy) An overview of the technologies available to display (and evaluate) Mathematics on the Web is presented. The possibility of carrying out threaded on-line conversations using Maths between groups of distant physicists, mathematicians, engineers and students/teachers is illustrated. Furthermore, the MathML tools being tested within the Xmath.org project, which aims to demonstrate and evaluate the use of XML (MathML) in mathematical courses on the Internet, are also discussed.