The book "Quantum-Mechanical Perturbation Theory - A Chart Method" by the authors of A. A. Kiselyov and A. In. Lyaptseva is a deep and fascinating dive into the world of quantum mechanics, which will be of interest to both students and professional physicists. If you are looking for a book that will help you understand the complex aspects of quantum theory and teach you how to use the diagram method, then this publication will be a real find for you. The authors, having rich experience in the field of theoretical physics, offer the reader a unique approach to the study of quantum mechanical perturbations. The book begins with the basics, gradually introducing more complex concepts, making it accessible to a wide audience. Students, graduate students and even experienced researchers will find here useful ideas and practical advice that will help deepen their understanding of quantum mechanics and its applications. One of the key topics of the book is the diagram method, which is a powerful tool for analyzing quantum systems. The authors explain in detail how to use Feynman diagrams to visualize particle interactions and simplify calculations. This makes the material not only more understandable, but also clear, which is especially important for complex mathematical concepts. The reader will be able to see how abstract ideas turn into specific graphical representations, which greatly facilitates the learning process. The book also touches on important aspects, such as the application of quantum mechanical perturbation theory in various fields of physics, including atomic, molecular, and condensed matter. The authors discuss how these methods can be used to solve real problems, which makes the material relevant and practical. This will especially attract the attention of those who are interested in modern research in the field of physics and want to be aware of the latest achievements. The style of presentation of the authors is clear and logical, which allows the reader to easily follow the course of thought. The book is written in accessible language, which makes it suitable not only for specialists, but also for those who are just starting their way in quantum mechanics. Kiselev and Lyaptsev skillfully combine theory with practical examples, which helps to consolidate the knowledge gained and put it into practice. If you are already familiar with other works of authors, such as "Quantum mechanics: basic principles" or "field theory in quantum mechanics", then this book will be a logical continuation of your study. It will not only expand your knowledge, but also deepen your understanding of quantum processes and their mathematical description. The book "Quantum-Mechanical Perturbation Theory - Diagram Method" will be of interest not only to students and graduate students of physics, but also to everyone who is fond of science, mathematics and philosophy. It will be an excellent addition to the library of any researcher seeking to understand the complex mechanisms that govern the microcosm. Do not miss the opportunity to touch the advanced knowledge in the field of quantum mechanics and discover new horizons of science along with this fascinating book.