I really do like the way the characters utilize equations and mentally manipulate numbers in order to achieve their magic. Having to invent new equations that relate others that you already know sounds and feels more like real math than the mathematical spells in books like Threshold or the reified numbers in Napier's Bones.

However, I find that I cannot strongly recommend this book, and it is not only because the "chosen one" theme has already been done to death. There were far too many scenes that I found unbearably disgusting. Not merely blood and guts, but also feces and men raping boys and monsters erotically circumcising boys with their mouths and... If that is your cup of tea, then this book is for you. Otherwise, I would suggest you read something else instead.