Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Unreadable

The author seems knowledgeable in the area he covers, but, unfortunately, can't write: there isn't one clear paragraph in the whole book, not one coherent chapter -- this book reads like a transcript of a mental patient's ranting: disjointed and random, ungrammatical, having no logical structure, no direction; with concepts used w/o being defined before (or after!); wrong words used all the time (or, alternatively, missing a word now and then) -- all in all, a sizeable load of gibberish that's torture to parse and impossible to understand. Even vector math itself is not defined!The author, if he must write at all, should team up with a competent technical writer, maybe as a coauthor, especially since the publisher, Wordware (based on my observations, a second-rate outfit in general) doesn't seem keen on providing adequate editorial contribution