The book “Operating Calculus and Nonstationary Phenomena in Electrical Circuits” by Mikhail Kontorovich is a unique work that immerses the reader in the world of electrical engineering and circuit theory. This edition will be a real find both for students of technical universities and for practicing engineers seeking to deepen their knowledge in the field of analysis of electrical circuits and non-stationary processes. In his book Kontorovich masterfully combines theoretical foundations with practical examples, which allows the reader not only to understand, but also to apply the knowledge gained in real situations. The author pays special attention to operational calculus a powerful tool that allows solving complex problems associated with dynamic processes in electrical circuits. This topic is especially relevant in the light of modern technologies, where the accuracy and speed of calculations play a key role. The book covers a wide range of topics, including the analysis of linear and nonlinear chains, methods for solving differential equations and their application to nonstationary processes. Kontorovich not only explains the theoretical aspects, but also offers many examples, which makes the material accessible and understandable. The reader will be able to see how operational calculus helps to simplify the solution of complex problems, which is especially important for those who work in the field of electronics, automation and energy. This book will be interesting not only for students and graduate students, but also for professionals working in the field of electrical engineering, radio engineering and related disciplines .. It is suitable for those who want to master new methods of analysis and design of electrical circuits, as well as for those who seek to improve their skills. If you are looking for literature that will help you understand the complex aspects of electrical circuits, then “Operating Calculus and Nonstationary Phenomena in Electrical Circuits” will be your reliable assistant. The topics raised in the book are relevant and important for the modern world, where electrical circuits play a central role in the functioning of almost all technologies. Kontorovich focuses on how changes in electrical circuits can affect their behavior and how to correctly interpret these changes. This makes the book not only a tutorial, but also a practical guide for engineers and researchers. The author's style is distinguished by clarity and accessibility, which makes it easy to assimilate even the most complex concepts. Mikhail Kontorovich is a well-known specialist in the field of electrical engineering, and his work is respected among professionals. He is also the author of other significant works that cover various aspects of electrical circuits and control theory. By reading his books, you can be sure that you are getting knowledge from a real expert. Thus, “Operative calculus and non-stationary phenomena in electrical circuits” is not just a book, but a whole encyclopedia of knowledge that will help you become more confident in your professional activities. If you want to deepen your knowledge in the field of electrical engineering and learn how to apply operational calculus in practice, this publication will become an indispensable source of information for you. Do not miss the opportunity to discover new horizons in the world of electrical circuits!