If you are a graduate student in the field of physics, this book is a MUST HAVE. Inevitably as an undergraduate you will be ill-prepared for what you are expected to know as a graduate student in physics. This book as thoroughly filled in the mathematical gaps that I was missing. This book was used as a text for my Methods of Theoretical Physics class and I can say that it is clearly leads you through every topic without much confusion. I will be using this text as a reference for years to come.