@cystic:
how much money do you have in your wallet Tim?
zero
well . . . that’s better than NO money . . . at least if you’re an engineer . . . :D
Being an engineer, I consider math useful when applied. Otherwise it can stay with the poetry books in the library.
As Meijing as explained, much better that I did, the value here is in describing what happens as a variable approaches zero either from a positive or negative term.
As for what Jen was attempting to plagerize, I will leave her hanging from her own petard.