This Book in Mathematical Analysis is devoted to the study of a variety of different problems arising in different contexts (a fact that clearly highlight the broad spectrum of the field). This volume collects the remarkable contributions by researchers working in this field, that participated in the Workshop on Mathematical Analysis in Alicante, that took place on January 15-17, 2020 (a short time before the CoVid- 19 pandemia covers the entire world) at the University of Alicante, Spain.