This book presents a new theory for evolution operators and a new method for defining fractional powers of vector operators. This new approach allows to define

The subject of this monograph is the quaternionic spectral theory based on the notion of S-spectrum. With the purpose of giving a systematic and self-contained

This book presents English translations of Michele Sce’s most important works, originally written in Italian during the period 1955-1973, on hypercomplex anal

This book presents the extensions to the quaternionic setting of some of the main approximation results in complex analysis. It also includes the main inequalit

This book surveys the foundations of the theory of slice regular functions over the quaternions, introduced in 2006, and gives an overview of its generalization