The book "Lectures on the theory of functions of a complex variable" by the authors Yuri Sidorov, Mikhail Fedoryuk and Maxim Shabunin is a unique educational material that will become an indispensable assistant for students and teachers of engineering, physical and technical specialties . This work not only covers theoretical aspects, but also offers practical examples, making it an ideal guide to a deep understanding of complex concepts. The book focuses on complex analysis, a branch of mathematics that studies the functions of a complex variable. The author’s team approached the presentation of the material with great attention, trying to make it accessible and understandable to readers, regardless of their initial level of preparation. Each lecture is permeated with logic and sequence, which allows the reader to step by step plunge into the world of complex functions, their properties and applications. The book will be of particular interest to students, graduate students, and faculty who study or teach mathematics, physics, or engineering disciplines. It can also attract the attention of researchers working in the field of theoretical physics and applied mathematics. If you are passionate about topics such as analysis, differential equations or mathematical physics, then this edition will be a real find for you. The authors raise many relevant topics such as analytical functions, Cauchy integrals, the deduction theorem and many other key concepts that play an important role in various fields of science and technology. They not only explain the theory, but also demonstrate how this knowledge can be applied in practice. This makes the book especially valuable for those who seek not only to study the material, but also to use it in real-world tasks. The style of presentation of the authors is clear and logical. They skillfully use examples and illustrations, which helps the reader to better understand complex concepts. Each lecture ends with tasks and questions that encourage the reader to independent reflection and practical application of the studied material. This approach contributes to a better understanding and consolidation of knowledge. In addition, it is worth noting that Yuri Sidorov, Mikhail Fedoryuk and Maxim Shabunin are not only the authors of this book, but also recognized experts in their fields. Their previous work has also received high praise among students and faculty, which confirms their authority and professionalism. They are actively involved in research and educational projects, which allows them to remain at the forefront of modern advances in mathematics and physics. If you are looking for a high-quality textbook on the theory of functions of a complex variable that combines theory and practice, then “Lectures on the theory of functions of a complex variable” is exactly what you need. This book will be your reliable companion in the study of complex mathematical concepts and will help you confidently move along the path to scientific and professional achievements. Do not miss the opportunity to enrich your knowledge and skills by immersing yourself in the world of complex analysis with this wonderful textbook.