Introduction to Quantum Mechanics (2nd Edition) Paperback Economy edition by. David J. Griffiths Paperback – September 17, 2015

After reading some critics, i feel like contributing to defend this text.First, when is this book useful?Based on the American educational system: when you're an undergrad student in physics, that is when you've already been exposed to the origins of quantum mechanics through a class often called "modern physics", and have some basics in calculus and linear algebra. But most importantly: if you intend to study physics further, because if you're just in for a tasting go for Susskind's or something similar.Now if you're a demanding or unusually advanced undergraduate student: relax !!!You will get to read many other books about QM so don't ask this one to be what it's not claiming to be:This is not an advanced text and by no means sufficient by itself if you're really committed to studying physics; it is not completely introductory either in the sense that you won't learn about the history of the subject or won't get a purely axiomatic, rigorous approach either. It is designed to make you USE quantum mechanics, sometimes (yes!) even before it tells you what you're doing, so that part of your deeper understanding is built out of your own experience studying examples or working through problems. This said, it also provides good insights and often takes the simplest route to make a point, with a language that i find as entertaining and clear as in his E&M book.Now studying QM will always be a tricky business because there are so many ways to approach the subject and try to make sense of it, while our brain is truly wired for classical mechanics. You will find the book that does it for you at some point but will have to read several of them no matter what: if you don't get a kick out of this one go somewhere else, but i personally found it extremely helpful and clear. My graduate text was Weinberg, which is fantastic when you're an advanced grad student but almost unreadable when you're not and i heavily relied on Griffiths and some other, popular intermediate books, to help decipher it.So this is a truly intermediate text and will take you to the meatier treatments of such as Sakurai, Merzbacher, Cohen-Tannoudji and others like a charm; if not, then just go straight to them. And if you're a Vulcan or a mathematician go straight to Weinberg!Good luck

Works great as a reference book

This is one of the most well-written scientific books I've ever read. The author writes to a beginner, and explains the concepts of quantum mechanics in a conversational, non-intimidating way. It is an excellent way to be introduced to the subject of quantum mechanics, to refresh, or to fill in gaps in understanding. It is somewhat limited in its scope: for instance, it does not cover the path integral formulation. However, if you're new to the subject, it is very helpful to cover only the essentials, and to leave the more advanced topics to a more advanced book.

Ok this is probably the most standard text for introduction to quantum mechanics courses.Griffths is a good writer and teacher!The book "speaks" to you as if Griffiths is there in front of you and lecturing.Quantum mechanics problems can be really really hard and LONG!!!so that's what this book has in for you!some problems are simple, but others will make you wish you had never been a physicist.Its in QM nature that problems are hard and long.The theory in each section is explained in an excellent and clear way.Every word in this text counts towards your understanding of QM concepts.The author knows its an intro to QM, yet should rely on heavy math to make the student appreciate the true "mathematical" nature of QM and the book is written accordingly to these standards.But there is no book that will give you everything at your first read: you will need to spend lots of time working on problems, going back to theory, re-read, re-understand. re-do problems...and goes on and on.So what i want to say is that no QM book is perfect and do not expect to master concepts just from this book.use other books aside from this to get a clearer understanding.In general the book is greatly written, smart and interesting (hard!!!) problems at each section.However, there are some flaws (which as a graduate student I had to deal with..).First, sometimes Griffiths skips some major steps when deriving important equations which can confuse the student.For example, in chapter 6 where he derives the fine structure equations for hydrogen he skips crucial math-steps of how he is getting the results.Also the equations for the weak/strong field Zeeman effect are not stated in clarity.Rather than,the equations are scattered within 2-3 previous subsections, and makes the student constantly flipping pages and trying to "connect" the dots. The intermediate Zeeman effect and Hyperfine structure is explained briefly which i think it's a topic which should have given more emphasis: like how to work on the matrix elements, and how can someone determine the "good" and "bad" quantum states appropriate for each case.

Griffiths is a great writer, with a sense of humor that shines through some pretty heinous maths, clearly explained. The discussion of the philosophical realm of quantum mechanics, with wierdness and paradoxes, is accessible and clear while being great food for thought and a stimulating starting point. Like with many physics texts, we get the sarcastic "it is left to the reader to prove", with a deferral to the excercises instead of a detailed proof or explanation. In this text it only happens when it would really be of benefit to do the problems, unlike in some other texts where the omissions in the chapter smell of condescension, or worse, of laziness of omission. This was my college textbook for two successive courses, but it also proved to be fun reading.