It certainly isn't simple. I'd gotten as far as the Wiki entry before but found it intractable. Even if I don't understand it there are some beautiful identities to be found though. Thanks for the replies.
I am looking for the solution for x of the equation ex = 1/x. I've looked around and the answers seem a bit incomprehensible, is there a more approachable explanation ? I've only done high school math but was pretty good at it. I'm hoping that I'm posting in an appropriate place for this question.