Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good idea; too bad about the errors

The book is in general a good idea but has a fatal flaw - it has many math errors. It looks as if the authors took their lectures on signal theory and shoved them into a wavelet context, without stopping to consider what needs changing. It seems every two pages or so is a significant error. This would be ok *if* there were a published errata, but I have found none via google. What good is a book full of errors?