Sorry, been off-air for a week.
What I was thinking, Mauno, was that the touch screen aspect of a mobile app would be useful in a mobile Moodle, how this could be done is way beyond anything I could achieve. Translating this back to laptops, desktops or any other non-touch screen device would not be tenable, I would think.
As I understand it, Australian schools have a limited free access to Wolfram Alpha, (how this happened or why I don't know, but Conrad Wolfram was widely reported here as making this offer) so I use it in class where I can. Never thought of developing any direct Moodle/Wolfram Alpha linkage as Moodle does have its own TeX Notation filter.
There is no way to easily add/edit equations/formulae, no matter whether they are maths, science or chemistry but the best we have so far seems to be TeX. I agree, not necessarily all that user friendly, and has a learning curve, but it is not that steep. The basics, and that is what most high school (secondary) teachers would really use, can be learnt pretty quickly. What I am suggesting is that the TeX Notation Filter in Moodle really needs to produce a better image than it currently does. An equation that is two or three sizes larger than it needs be, that does not always sit properly on the line, that does not always have appropriate spaces inside itself, these things are the issues that turn people off using Moodle's TeX Notation. I write a text, say, in TeX Live's editor, and it comes up perfect. I write the same text in Moodle and it requires an awful lot of tweaking just to look passable, and that is the essence of the problem.
AFAIK, there is no new technologies required, there is no huge development commitment, nothing really new, just refinement of existing technologies inside Moodle. I may be wrong in that it might require a new engine and specific maths/chem packages, but if that be the case, if it is actually part of core, then there is a real advantage that accrues to Moodle, who else does it?