What is your problem Paul? You still haven't looked up the stereo definitions, I'm not doing it for you I'm afraid. Your pointlessly arguing and now questioning if the stereo equations actually exist?! You can find them yourself, plenty of AES papers, probably have them on an ambisonics site somewhere.

The normal is perpedicular to the imaginary line across the front of the listeners nose, where the line extends from. If you engaged your brain before posting it wouldn't be hard to figure that out.

I'm back to incoherence because you don't understand what I'm talking about, sorry.