This book is intended to help the students of the faculties of science and polytechnics, as well as the students of T.E.I. to understand the elements necessary for their studies from the voluminous branch of mathematics, complex functions.
Special emphasis was given to integral functions, complex integrals, residues and series of complex numbers due to their many applications. In the last chapter (which also includes about forty solved theoretical exercises), the analytic expansion of a complex function and infinite products are particularly highlighted.