I now see why this book is so highly regarded.  My university uses it as the textbook for Math Methods in Physics which is a required course of all physics majors.  I haven't gone all the way through it yet, but what I have worked through, I really like.  I am a 4th year physics (2nd bachelors) student but before I started this physics degree I was not too math savvy.  Good with numbers, yes but I didn't even know what a derivative was until 3 years ago.  I only bring all that up because after the past three years of physics undergrad math being quite challenging for me, this book does a great job of wrapping it all up in the context of physics and making it all finally click.