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This three-volume monograph in partial differential equations has quickly become a classics in mathematical analysis. Its breadth is unparalleled, covering such diverse topics as stochastic differential equations, fluid mechanics, wave propagation, and relativity. In its variety the material is presented in a modern and cohesive way, which emphasizes the deep interplay between geometry and analysis.

This book has shaped my research since the time of my PhD dissertation, when I had the privilege to be Michael Taylor's student. I still use on a daily basis.