Textbook in PDF format This book is intended as a first course in the theory of functions of a single complex variable for students (of Engineering, Physics or Mathematics) who have already acquired the fundamental notions of real Mathematical Analysis. It is the (updated) English version of an older book, published by Springer in Italian, based on the lectures given by the author to the students of the University of Rome “La Sapienza” and of the Scuola Superiore di Catania. The claim of mathematical rigor is accompanied by the idea that students should also develop know-how skills: half of the book is devoted to the detailed solution of 288 exercises illustrating, also with figures, the theory. Also, the choice of the topics reflects the above point of view. Preface. Complex Numbers. Metric Spaces. Limits and Continuity. Sequences and Series of Functions. Derivatives and Analytic Functions. Elementary Functions. Integrals. Taylor and Laurent Series. Residues. Applications of Residues. Further Properties of Analytic Functions. Solutions to the Exercises. (212 pages !) References. Index