Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A great book, which I'll explain later in the review.

This is a fine book that lays out clearly Riemann's life and times and the mathematical work he did, but I'll explain more about that later in the review.The author certainly knows his subject matter and it thoroughly researched, which I'll touch on a little later. The only thing that drove me to distraction was that at least 2 times in every chapter he would make a point, then say something like "I'll explain more about this in just a bit" or "More about this later" or "In chapter 12 I'll touch on this again". I'm not kidding, it happened EVERY chapter and after a while it got annoying....but I'll show you more about that in my other review.Still, a great read and required reading for anyone into mathematics and number theory.