This book is must have for any software programmer. It is one of the best book I had ever had. It has many mathematical concepts and ppl who are mathematical geeks with software skills will love this book even more like me. This was the first book i bought from Used book section and I am extremely satisfied with the condition. I was quite skeptical when I was buying the book, but the sellers are really good with the what they promised. I am totally impressed and i really appreciate it.Thanks Guys.