I have a PhD in physics. My adviser and I used say (as a joke, but with a kernel of truth) that there's no need to go beyond chapter one of a given Landau & Lif

I have a PhD in physics. My adviser and I used say (as a joke, but with a kernel of truth) that there's no need to go beyond chapter one of a given Landau & Lifshitz book to perform research on the subject. In fact, if you were to look at my phd thesis you'd find a number of references to the relevant L&L book but none past the first five equations or so.