I actually specifically called out sigma notation as something I *do* actually understand. So like, the book will have W_q(t) = Pr{T_q <= t} and like I just don't know what it means to write curly brackets after some letters like that. And there's stuff in there that I definitely know, like p(x) almost certainly means probability of x, but then the writer never bothers to explicitly define it like that or define the notation he's using. But the book is full of things like that where there will be an r in the formula or an s in the formula and I'm like where did this letter come from? And sometimes if you go back a couple of pages there's a suggestion that s might mean something, but most of the time its pretty ambiguous and the author is just expecting that what he's doing is obvious and doesn't need to be explicitly, rigorously stated. Most of it isn't bad if you do know stats, but the book is just barely outside of my grasp because it makes it just that much harder to read.
