[my_username_is_]

it's using log to mean log base e, also known as the natural log or ln. you can do that because they're inverse operations (I think that's the right term for it, it's been a while since a formal math class) so they undo each other

[clebio]

Yes. It's an identity relationship. x = exp(log(x))

http://en.wikipedia.org/wiki/List_of_logarithmic_identities#...

[blackrabbit]

Thanks!