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Title: Terrible book. Does not properly explain even the most basic topics
Review: Unless you happen to already be a math PhD or child prodigy, do not listen to the 4 and 5 star reviews. For us mere mortals, this is a terrible textbook. Instead of laying out proofs as formulas, almost everything is in paragraph form. In addition, the author has a terrible habit of saying "Given premise A, one can easily come to conclusion Z" with no mention of steps B through Y. This is not for the problems marked difficult at the end of the chapter. This is the first thing that he will say at the introduction of a topic. Do yourself a favor and look at Springer's undergraduate math series books in partial differential equations. Also, you can google "Paul's Math Notes". This will at least give you the basic introduction you need to understand the heat, lagrange, and wave equations.
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