books.google.com - One of the most fundamental and active areas in mathematics, the theory of partial differential equations (PDEs) is essential in the modeling of natural phenomena. PDEs have a wide range of interesting and important applications in every branch of applied mathematics, physics, and engineering, including...http://books.google.com/books/about/Linear_partial_differential_equations_fo.html?id=Zbz5_UvERIIC&utm_source=gb-gplus-shareLinear partial differential equations for scientists and engineers