Six Not-So-Easy Pieces: Einstein's Relativity, Symmetry, and Space-Time

Six Not-So-Easy Pieces is the sequel to the book Six Easy Pieces. The first book is a collection of six of the easier lectures from Feynman's freshman and sophomore physics classes at CalTech. Six Not-So-Easy Pieces are some of the more difficult lectures from those classes. In contrast to the first book, these lessons are much more mathematical. Freshman calculus is definitely a prerequisite to reading this book. Courses in vector calculus and differential equations will help the reader to more completely understand the works, but they are not absolutely necessary. However, without much mathematical knowledge, one can just take Feynman at his word for all the equations, reading mainly the conceptual explanations, but one will invariably miss out on some of the points. For anyone reading the book, Feynman's teaching style is something that can be enjoyed. He explains the concepts in a comprehensive and not-too-difficult manner and seems to have a full understanding of what the student in the lecture hall is thinking. The six topics (chapters) covered in this book are: Vectors, Symmetry in Physical Laws, The Special Theory of Relativity, Relativistic Energy and Motion, Space-Time, and Curved Space. This book is in no way a survey of physics. It is more of a sampling of Feynman's teaching. However, the common thread that runs through the six pieces is that they all relate to understanding relativity. For the layman who has a mathematical background and wants to understand the concept of relativity, this book is an excellent help. I would suggest reading Six Easy Pieces before reading this book, but it is not necessary. If you enjoyed reading the first book, I would highly recommend this one and vice versa.

Feynman's Not So Easy Pieces is not so easy to get through, unless you have a degree in QED. But, it is worth trying to get through.Feynman brings to each piece his unique ability to describe the very complicated in a way that makes you understand what he is talking about if not exactly what he means. He never talks down to his audience so don't expect any favors - there is no grading on a curve in Feynman's universe. There are lots of ideas about how the universe works. More importantly for the non-scientist, there is way of looking at the world that is uniquely "scientific" - that is, amazed and informed by each thing in it.

"Six Not-So-Easy Pieces" are six selections from the Feynman "Lectures on Physics". They represent not the hardest material to be found in the "Lectures" (and certainly not elsewhere concerning Feymnan's essays or other lectures) but perhaps some of the most thought-provoking and challenging conceptually (although, if you would like a conceptual challenge, check out Feynman's "QED"). Spacetime, Relativity (Special and General), Vectors, Symmetry --- there is no end to the knowledge and unique grasp of physics that Feynman possesses. I recommend this book highly to anyone with the impulse to ask, "Why?"

As in the first book, Feynman clearly explains each concept from vectors to curved space-time in a manner suitable for those embarking on those concepts. Even persons who have already read texts on special relativity and space-time can benefit, in part, from reading this book. And any student or novice beginning with these concepts will find this book invaluable. Nothing less could be expected from Feynman!

These lectures where designed to give the student the reasoning behind relativity. Unlike some books, this book does not just explain the results or phenomena of relativity. Feynman actually explains the problems with Newton's laws and actually derives and gives the reasoning for Einstein's theories about relativity. These lectures need only some calculus and basic physics knowledge to appreciate. However, as with most bonfide scientific literature, the more "mathematically and scientifically mature" the reader the better. Feynman uses pieces of calculus (very basic stuff), algebra (symmetry, vector notation, cross products, and dot products), geometry (non-Euclidian), and basic physics knowledge (conservation laws, Newton's laws, Maxwell's equations etc). You don't need all of this to listen and understand the lectures, but obviously the more the better. Feynman also does a good job of explaining some the mathematics involved as well. The lectures pretty much follow the book so you can read along while you listen. These are actual lectures that Feynman gave at Caltech to undergraduates so they are very rigorous. In short, the lectures were clear, very understandable, and offer something to everyone. You don't need anything more than a solid background in calculus and introductory physics to get something out of these lectures.