Have a look over it. Comments/suggestions/corrections all welcome.
Hopefully lots of people will get benefit from this (if they know about it, that is!).
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
A very useful tool for learning.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.