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Title: Astonishing error
Review: The book tries to "prove" the maximum principle resorting to an argument based on steady-state solutions to the Laplace equation. This makes no sense whatsoever because time does not enter the Laplace equation. I found this error so astonishing that I gave up on the text. One can only imagining how confusing a student would find this type of explanation. Maybe it is the only such error in the book..... but it is hard to believe it has survived to a 4th edition.
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