Yet another classic. Concrete Mathematics is the second most accessible book by Knuth as one of the co-authors. Concrete Mathematics is a blending of CONtinuous and disCRETE mathematics. This book focuses on practical skills rather than theory. It contains many examples, tricks of trade, and problems with solutions. This book is also fun to read. After reading this book you will be very comfortable manipulating sums, recurrences, discrete probabilities, and number theory.<br><br>I've placed this book #15 in my Top 100 Programming, Computer and Science books list:<br><br>http://www.catonmat.net/blog/top-100-books-part-three/<br><br>.