The theory of pseudo-differential operators (which originated as singular integral operators) was largely influenced by its application to function theory in on

This textbook provides a self-contained and elementary introduction to the modern theory of pseudodifferential operators and their applications to partial diffe

The main aim of this book is to introduce the reader to the concept of comparison algebra, defined as a type of C*-algebra of singular integral operators. The f

In this introductory textbook, a revised and extended version of well-known lectures by L. Hörmander from 1986, four chapters are devoted to weak solutions of

I had mixed feelings when I thought how I should prepare the book for the second edition. It was clear to me that I had to correct all mistakes and misprints th