The book "Four lectures on numerical methods in the theory of diffraction" by the authors Sveshnikov A. G. and Ilyinsky A. C. It is a unique study that immerses the reader in the world of complex mathematical models and their applications in physics. This publication will be a real find for students, graduate students and specialists in the field of physics, mathematics and engineering, interested in the theory of diffraction and numerical methods. In their lectures, the authors consider in detail the main aspects of numerical methods that are used to solve problems related to wave diffraction. The book covers a wide range of topics, ranging from the basics of diffraction theory to modern approaches to numerical calculations. The reader will be able to learn how to effectively use numerical methods to analyze and model various physical phenomena, making this publication useful for both theorists and practitioners. The book will be especially interesting to those who are fond of physics and mathematics, as well as those who are engaged in scientific research in the field of optics, acoustics and radiophysics. Students and graduate students studying relevant disciplines will find in it not only theoretical foundations, but also practical examples that will help to better understand complex concepts. In addition, researchers and engineers working in the field of development of new technologies will be able to use the acquired knowledge to solve urgent problems. One of the key topics raised in the book is the application of numerical methods to model the diffraction of light and other waves. The authors emphasize the importance of accuracy and reliability of calculations, which is especially relevant in modern conditions, when the requirements for the results of scientific research and engineering developments are becoming increasingly high. The book also raises questions about how numerical methods can help in solving practical problems, such as designing optical systems and analyzing signals. The style of the authors is clear and accessible, which allows the reader to easily assimilate complex mathematical concepts. Sweshnikov A. G. and Ilyinsky A. C. Experienced teachers and researchers who know how to bring complex ideas to their audiences Their previous work is also noteworthy, as they cover a wide range of topics in physics and mathematics, which confirms their expertise and in-depth knowledge in the field. The book "Four Lectures on Numerical Methods in Diffraction Theory" is not just a textbook, but also a source of inspiration for those who seek new knowledge and discoveries. It opens the door to the world of numerical research and shows how mathematical methods can be used to solve real-world problems. This publication will be an indispensable assistant for anyone who wants to deepen their knowledge in the field of diffraction and numerical methods, as well as for those who are looking for new approaches to solving complex scientific and engineering problems. If you are looking for books on numerical methods, diffraction theory or mathematical physics, then this publication must be in your library. Not only will it broaden your horizons, but it will also help you become more confident in your knowledge and skills in this fascinating and challenging field of science.