Partial Differential Equations by Peter David Lax is a comprehensive textbook that covers the fundamental concepts and techniques of partial differential equations. The book is designed for students who have a solid background in calculus, linear algebra, and ordinary differential equations.The first part of the book introduces the basic theory of partial differential equations, including the classification of equations, the method of characteristics, and the Fourier series. The second part of the book focuses on specific types of partial differential equations, including the wave equation, the heat equation, and the Laplace equation. The author provides numerous examples and exercises throughout the book to help students develop their problem-solving skills.The book also covers more advanced topics, such as nonlinear partial differential equations, numerical methods, and the calculus of variations. The author emphasizes the importance of understanding the physical context of partial differential equations and provides many real-world examples from physics, engineering, and other fields.Overall, Partial Differential Equations by Peter David Lax is an excellent resource for students and researchers in mathematics, physics, engineering, and other related fields. The book is well-written and provides a clear and concise introduction to the subject matter.Additional Contributor Is A. Lax.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.