Instruct: Classify Amazon reviews into positive or negative sentiment
Query: many helpful examples

The mathematical approach is very solid. The authors really try to explain everything and often are successful in this. However the mathematics are difficult to grasp for undergraduate students that do not have a background in mathematics. There are many worked examples in the book. That always helps a lot!I have a few objections:- there are far too many boxed equations, so that students become confused. Unimportant equations, or equations that are just repeated to show that the are not valid anymore should be left out or printed nondescript instead of emphasized- there are many errors in the book. Did nobody see that even the Maxwell equations in Ch. 5 are wrong ??- in the problems, the use of units or the given solutions are often inconsistent