this is my first post here.
I've written a text about quaternions in physics.
It has grown a bit. I would like to hear some comments about this text.
The topic is quite interesting. You can do everything with quaternions, as far as I can see.
The text is a google.doc presentation. It is quite annoying, but google. docs have benefits, i.e. there is a build in chat system, that you can access if you have a google account.