The book is mainly addressed to students at technical faculties and it contains elements of the following areas of the Mathematics: Complex Analysis, Ordinary Differential Equations, Fourier Series, Laplace Transform, Fourier Transform, Z Transform.

Due to the numerous applications encountered in the mathematical modeling of various real world phenomena, these chapters have always been of major interest. 

The general theoretical framework of each chapter contains the definitions of the new notions, as well as their basic properties and related results, most of them being followed by complete proofs and illustrated by examples solved in detail, for a better understanding of all the presented aspects.

Through the theoretical aspects presented, the examples, and the exercises solved or proposed in each chapter, the book is a useful tool in the preparation of various exams or student competitions.