This book deals with elliptic differential equations, providing the analytic background necessary for the treatment of associated spectral questions, and coveri

This book is an updated version of the classic 1987 monograph "Spectral Theory and Differential Operators".The original book was a cutting edge account of the t

This EMS volume contains a survey of the principles and advanced techniques of the spectral theory of linear differential and pseudodifferential operators in fi

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

This book could be used either for self-study or as a course text, and aims to lead the reader to the more advanced literature on partial differential operators