Equations are written using the TeX or LaTeX typesetting language (a text-based means of representing mathematical notation). There are many tutorials on line where you can find out how this is done). A lot of people are asking for a more "intuitive" method of editing mathematical equations, and there have been some references for some approaches to that in other messages on this forum, but right now, all the solutions use text-based representations in one form or another.
Davide
Mathematics tools
Problem with algebra, TeX and jsMath in Moodle 1.6
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