Brzdek, J: Ulam Stability of Operators

"Therefore, as the authors write in the Preface of this book, the aim of this book is not merely to present a survey of research papers dealing with the stability theory of functional equations, but rather to propose a somewhat new systematic approach to investigating Ulam stability. Some open problems are also stated, suggesting further possible exploration in the corresponding areas.

This book consists of six chapters. Each of them has a short and informative abstract as well as a list of references." --Zentralblatt Math