I've been working through this book. I learned quantum in my undergrad years from the Tannoudji book. It was very dry and I spend most my time trying to figure out what he (Tannoudji) was trying to say, THEN figure out whether I can prove it, etc. Funny how really smart people can create creatively new ways to make stuff more difficult through weird explanations.<br><br>This is not so with Susskind. Susskind writes like Feynman: clear explanations on complex topics. I assume he's a native english speaker, as his tone is very colloquial and uninimtidating. He assumes the reader knows nothing of quantum and explains things in bit-sized pieces which are easy to digest. He rarely says things like "well OBVIOUSLY this flows from this" (when the things are so obvious).<br><br>Anyways, the book is a bit unorthodox. It starts off talking about spin states and vector spaces. This is different than the typical quantum books that start off with talking about solving the Schrodinger equation. Which, now that I think about it, isn't really a great place to start. It's a wave equation that's only once-piece of the bigger picture.<br><br>The result is a book that has a very gradual learning curve.<br><br>That said, readers still need a bit of math background if they want to get through this book. I'd say at least a decent understanding of complex numbers and matrix algebra are a prerequisite. Both those subjects are thoroughly explained in places online (Khan Academy) for free.<br><br>SOLUTIONS:<br>I read another reviewer rate the book low because there is a lack of worked out solutions. That I disagree with.<br><br>Google search "Quantum theoretical minimum solutions" and they will pop up. There are several unofficial sites out there that have answers to the solutions. For instance, google search "the uncertain biscuit quantum" or "chris brittain quantum". The solutions are out there.<br><br>Also, on that note, the problems in this book are few..but concise and great. Very on-point.<br><br>Regarding the reviewers who are rating this book low b/c it's too difficult. That's not really a good reason to rate a QUANTUM book low. For two reasons (1) it's a quantum book for christsakes. it is by far the most math-friendly book written on the subject. reading about quantum mechanics without math is not "doing" physics..it's just cataloging knowledge (e.g. stamp collecting), (2) how can you rate a book low if you don't understand it? What are your reviewing parameters?<br><br>If you have a little complex number knowledge and rudimentary matrix operations (e.g. matrix multiplication, etc.) under your belt, you'll be fine.<br><br>The Kindle version is fine. That's what I bought (I have a paper copy too). I prefer the kindle version because I can read it on my phone while waiting in line, etc. The equations come out fine (I'm not sure what the other revieweres were complaining about, I'm reading it on my iPhone 5s just fine.)<br><br>If you know nothing of quantum and want to learn, I highly HIGHLY recommend this book.