This rating applies to the Kindle edition of this book only. The Kindle Edition of volume 1 looks fine, but somehow the Kindle version of volume 2 got mangled- it looks like a bad scan, with parts of letters missing, which makes some of the algebra almost unreadable. How on earth did someone mess up that badly and not notice? I thought the Kindle used vector fonts, and I didn't even know an eBook could look this bad.This is a great book content wise, with the clearest explanations around of these concepts- see other reviews. Just don't buy the Kindle version!