Hi Brian,

re:
> I'll agree with you on the Pos/Neg concept. (Never seen this notation before, and ve is not defined in the text, AFAIK.)

I guess it's kind of a British thing.

Some refs:
https://mathhelpforum.com/t/ve-notation-for-roots-positive-negative-etc.179997/
https://meta.stackoverflow.com/questions/427120/should-ve-ve-notation-be-tolerated-in-stack-overflow
https://electronics.stackexchange.com/questions/716904/what-is-the-history-and-meaning-of-letters-v-and-e-in-expressions-ve-and-v

- Michael