Theory of Poker and mistakes
First is the Fundemental Theorem of Poker. It's not fundemental, it's not a theorem, and it's not about poker.
It basically says that if I have KK and you raise for all the chips and I know you have AA, KK, QQ, JJ and each of those possibilities is equally likely then I've made a mistake if I call and it turns out you have AA.
It's results oriented, it says it's a mistake to act on what you actually know, it has nothing to do with expected value. It's wrong.
The other error is David's idea about playing hours, not results. He claims that if you have an overall expected value of $1 per hour and you play 10 hours then you've earned $10 no matter what the actual outcome.
That's wrong on so many levels it takes more than a single blog post to discuss it. It's just an absurd idea.