This book is a complete guide to the current state of geometric algebra with early chapters providing a self-contained introduction. Topics range from new techniques for handling rotations in arbitrary dimensions, the links between rotations, bivectors, the structure of the Lie groups, non-Euclidean geometry, quantum entanglement, and gauge theories. Applications such as black holes and cosmic strings are also explored.
At the beginning of the book great explanations for where cross products come from, why they only exist in 3 dimensions and how they relate to quaternions and complex numbers. Later the book goes on to rewrite a lot of physics in terms of "new" operations and explains why they're better.
First part - very useful and interesting.
The rest - seems like it might be very cool for people who really care about neat and elegant math, but I suppose not particularly useful if you treat math as a practical tool. I have a feeling mathematicians might enjoy this book more than physicists, despite the title ;)