Cougar,
Thank you for the link to the pdf-file. I downloaded it, but I will have to wait for the weekend to read it. Hopefully, I will understand at least 40% of it.

(I wonder if "I downloaded it" is correct grammar)

__________________
If everyone had even a basic grasp of scientific principles, this planet would be a better place (Phil Plait)

Die Lücke, die wir hinterlassen, ersetzt uns vollkommen [The gap we will leave behind will take our place entirely] (Carl Heinz Schroth)

1 + e^i*pi = 0