"Differential Equations, Theory of Functions of Complex Variables, Fourier Series" . Methodological Developments for Practical Classes" is a unique manual created by a team of authors, which will become an indispensable assistant for students, graduate students and teachers engaged in mathematical analysis and its applications. This edition contains methodological developments that will help readers not only to master the theoretical foundations, but also to successfully apply them in practice. The book focuses on three key topics: differential equations, the theory of functions of a complex variable, and the Fourier series. Each of these topics is fundamental in mathematics and has wide applications in various fields of science and technology. The authors strive to make complex concepts accessible and understandable, offering readers not only theoretical calculations, but also practical tasks that will help to consolidate the knowledge gained. The book will be especially useful for students of technical and natural sciences, as well as for anyone interested in mathematics and its applications. If you study physics, engineering or computer science, then this manual will become a real storehouse of knowledge for you. It is suitable both for self-study and for use in the educational process, which makes it a universal tool for anyone who wants to deepen their knowledge in the field of mathematics. The topics raised in the book cover a wide range of issues, ranging from the basics of differential equations to complex aspects of the theory of functions of complex variables. The authors focus on the practical application of this knowledge, which makes the material especially relevant for students seeking a real understanding of the subject. The book also discusses Fourier series, which play an important role in the analysis of periodic functions and have many applications in physics and engineering. The style of the authors is distinguished by clarity and logical presentation, which allows readers to easily assimilate complex concepts. Each chapter contains many examples and tasks that help to consolidate theoretical knowledge and develop skills in solving practical problems. This approach makes the book not only a textbook, but also a real guide to the world of mathematical analysis. If you are looking for literature that will help you understand differential equations, the theory of functions of a complex variable and the Fourier series, then this edition will be an excellent choice for you. It can be interesting not only for students, but also for teachers who are looking for high-quality teaching materials for their classes. The book will also be useful to those who are preparing for exams or want to refresh their knowledge in these areas. Do not miss the opportunity to immerse yourself in the world of mathematics with this book. It will open up new horizons for you and help you better understand the complex concepts that underlie many scientific disciplines. “Differential equations, the theory of functions of a complex variable, Fourier series” is not just a textbook, it is your reliable companion on the way to knowledge and success in learning mathematics.