TITLE: Introduction to Pseudodifferential operators
QUESTION [5 upvotes]: I'm interested in elementary introduction to pseduodifferential operators and its application to hyperbolic PDE's. I know measure theory, Fourier analysis and some elementary(linear) hyperbolic PDE's but not functional analysis, distributions, Sobolev spaces,etc. Can you recommend suitable intro text? Thanks

REPLY [3 votes]: The best introduction is Raymond Elementary Introduction to the Theory of Pseudodifferential Operators CRC Press.