Answer:
Here are some recommended books on partial differential equations (PDEs) from beginner to advanced level:
1. "Partial Differential Equations: An Introduction" by Walter A. Strauss: This is a great introductory book on PDEs that covers the basics of first-order equations, second-order equations, and higher-order equations.
2. "Partial Differential Equations" by Lawrence C. Evans: This is a more advanced textbook that covers a wide range of topics in PDEs, including elliptic equations, parabolic equations, hyperbolic equations, and conservation laws.
3. "Nonlinear Partial Differential Equations" by Peter J. Olver: This is an advanced book that covers the theory and applications of nonlinear PDEs, including Hamiltonian systems, solitons, and integrable systems.
4. "Introduction to the Theory of Nonlinear Elliptic Equations" by V. G. Maz'ya and S. Poborchi: This is an advanced book that provides a comprehensive introduction to the theory of nonlinear elliptic equations.
5. "Geometric Partial Differential Equations and Image Analysis" by Guillermo Sapiro: This is an advanced book that covers the application of PDEs to image analysis, including topics such as denoising, segmentation, and registration.
These books provide a good foundation for understanding PDEs and their applications, and can be useful for students and researchers at various levels of expertise.