Dear Math Tools forum members,

Does anyone know if there is a change in the TeX encoding for the notation to describe systems of equations, piecewise funcions, parametric equations, and things of the sort, where one has to use a large curly bracket (or may be two) encompasing more than one line of math expressions?

I had a perfectly working set of quizzes in Moodle 1.9, and after the change my school did to Moodle 2.0, the TeX encoding I have for these "multiple line" mathematical expressions are sometimes not rendered at all. Is Moodle 2 using some different decoding procedure?

For example, the following expression is not rendered by Moodle 2, while it was by Moodle 1.9:

$$ \left\{ x(t) = 3t^2 - 2t \atop y(t) = 5 - t^2 \right\}$$

or

$$ \left\{ x(t) = 3t^2 - 2t \cr y(t) = 5 - t^2 \right\}$$

I am not sure if the problem is that my school uses Moodlerooms instead of hosting their own Moodle server, and the TeX being used is different from before... Any suggestion will be greatly appreciated. Right now my only desperate solution to the broken quizzes is to replace the expressions by images, but this is not what I would like since editing for typo fixing becomes much more complex.

I looked into Moodle Docs regarding TeX notation, and I see a number of pages on Math expressions with fractions, square roots, matrices, and even geometrical figures, but nothing on this type of notation. Could someone point me to the appropriate documentation on these, or cast some light on what is the correct way of doing it in Moodle 2?

Thank you for any help!

Cristina