Peter Norvig's book reviews on Amazon(amazon.com)

    To the reviewer who said "I was looking forward to a detailed insight into
    neural networks in this book. Instead, almost every page is plastered up
    with sigma notation", that's like saying about a book on music theory
    "Instead, almost every page is plastered with black-and-white ovals (some
    with sticks on the edge)." Or to the reviewer who complains this book is
    limited to the mathematical side of neural nets, that's like complaining
    about a cookbook on beef being limited to the carnivore side.