The book "Differential and Integral Equations, Variational Calculus in Examples and Tasks" by Vasilyev A. B. and other authors is a real treasure for students, graduate students and teachers involved in mathematics and its applications. This edition not only covers a wide range of topics related to differential and integral equations, but also offers the reader a unique approach to the study of calculus through practical examples and problems. Vasiliev and his co-authors invite the reader to immerse himself in the world of mathematical concepts that underlie many scientific and engineering disciplines. The book begins with the basics, which makes it accessible to those who are just beginning to get acquainted with this topic. However, despite its availability, the material is presented in a deep and detailed format, which allows more experienced readers to delve into complex aspects and nuances. One of the key features of this publication is its practical focus. The authors are not limited to theoretical calculations, but offer many examples and tasks that help to consolidate the knowledge gained. This makes the book an ideal study guide for students preparing for exams or wanting to improve their skills in solving mathematical problems. Readers interested in topics such as applied mathematics, physics, economics, and engineering will find many useful materials in this book. The book also touches on important topics, such as methods for solving differential equations, features of integral equations, and principles of variational calculus. These topics are not only relevant to theorists, but also have practical significance in various fields of science and technology. For example, variational calculus finds application in mechanics, optimization theory, and even economics, making its study particularly important for future specialists. The style of writing of the authors is clear and logical . They strive to convey complex mathematical ideas in a simple and understandable language, which makes the book available to a wide audience. This is especially important for students who may have difficulty learning such complex topics. In addition, the book contains many illustrations and graphs that help to visualize the material and better understand it. If you are already familiar with other works by Vasilyev, such as Mathematical Analysis or Theory of Functions of a Complex Variable, then you will be interested to see how the author applies his knowledge and experience in this book. His ability to explain complex concepts and give real-life examples makes each page fascinating and informative. The book “Differential and Integral Equations, Variational Calculus in Examples and Tasks” will become an indispensable assistant for anyone who wants to deepen their knowledge in the field of mathematics. It is suitable for both students and teachers, as well as for anyone interested in mathematical methods and their application in various fields of science. Do not miss the opportunity to discover the world of differential equations and calculus with this fascinating and informative edition.