content: For anyone looking for an introduction to math, geometry more specifically, or philosophy at large, this is THE book, and in my estimation, THE edition to get. Heath is no fly-by-night pop-philosopher. His notes are almost as worthwhile as the text itself... a truly monumental feat.The rigors of geometry, the method of logic learned in these proofs, are one of the best ways to prepare the mind for real philosophy. Anyone can talk about the true and the good in a manner that inspires awe through vagueness and transcendent language, but that is a very different matter than the sort of philosophy that is built upon the real work of logic and hard-earned definitions.If you have any interest in the latter, I heartily commend this book to you.