Where can I go to find out more about options and greeks, specifically how greeks effect each other? I am not looking for definitions, that I have, I am looking for explanations. (web site, book etc) anything free to cheap I have seen option prices move little, not at all or even down when stock price goes up. (I have no specific examples) Could following a stock too close (min by min) cause this strange occurrence? I was under the impression that options moved as fast as stock. Still I would like to know more about the greek relationship. . . If there is a formula like: delta = .5 at said time / vega I will understand that the easiest. Thanks!