edition of Partial Differential Equations provides an introduction to the basic properties of  PDEs and the ideas and techniques that have proven useful in analyzing them.  It provides the student a broad perspective on the subject, illustrates the incredibly rich variety of phenomena encompassed by it, and imparts a working knowledge of the most important techniques of analysis of the solutions of the equations.  In this book mathematical jargon is minimized.  Our focus is on the three most classical PDEs: the wave, heat and Laplace equations.  Advanced concepts are introduced frequently but with the least possible technicalities.  The book is flexibly designed for juniors, seniors or beginning graduate students in science, engineering or mathematics. 

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