Fourier Analysis and Nonlinear Partial Differential Equations In recent years the Fourier analysis methods have expereinced a growing interest in the study of partial differential equations. In particular those techniques based on the Littlewood Paley decomposition have proved to be very efficient for the study of evolution equations. The present book aims at presenting self contained state of the art models of those techniques with applications to different classes of partial differential equations: transport heat wave and Schrödinger equations. It also offers more sophisticated models originating from fluid mechanics (in particular the incompressible and compressible Navier Stokes equations) or general relativity. It is either directed to anyone with a good undergraduate level of knowledge in analysis or useful for experts who are eager to know the benefit that one might gain from Fourier analysis when dealing with nonlinear partial differential equations. Preface 1. Basic analysis 2. Littlewood Paley theory 3. Transport and transport diffusion equations 4. Quasilinear symmetric systems 5. Incompressible Navier Stokes system 6. Anisotropic viscosity 7. Euler system for perfect incompressible fluids 8. Strichartz estimates and applications to semilinear dispersive equations 9. Smoothing effect in quasilinear wave equations 10 The compressible Navier Stokes system References. List of notations Index.