The book "The simplest variant of nonlinear deformation relations in cylindrical coordinates" by Grigolyuk E. and . and Nosatenko P. I. It is a unique study that immerses the reader in the complex but fascinating world of deformation mechanics. This work will be a real find for students, graduate students and specialists in the field of mechanics, materials science and engineering who want to deepen their knowledge in the field of nonlinear deformation processes. In this book, the authors offer the reader an original approach to the analysis of deformation ratios using cylindrical coordinates. This makes it possible to more effectively solve problems related to the deformation of materials and structures, which is especially important in modern engineering. Grigolyuk and Nosatenko not only outline the theoretical foundations, but also support them with practical examples, which makes the material accessible and understandable even for those who are just starting their way in this difficult field. The book covers a wide range of topics, including the basic principles of nonlinear mechanics, methods of mathematical modeling and numerical methods used to solve deformation problems. The authors emphasize the importance of choosing the right model to describe the behavior of materials under load, which is a key aspect in the design and analysis of structures. Readers will be able to see how the theory is applied in practice, which makes the material not only theoretically significant, but also practically useful. This work will be of particular interest to engineering students, graduate students and faculty, as well as practicing engineers working in the field of mechanics and materials science. The book can be an excellent addition to textbooks and reference books, as well as a useful resource for those engaged in scientific research in this field. It is suitable both for students studying the mechanical properties of materials and for experienced professionals who want to update their knowledge about modern approaches to deformation analysis. The style of the authors is distinguished by clarity and logical presentation, which makes it easy to assimilate even the most complex concepts. Grigolyuk and Nosatenko use many illustrations and graphs that help visualize the processes described and make the material more accessible. This particular attention to detail and the desire for clarity of presentation sets their work apart from other scholarly publications. The book "The simplest variant of nonlinear deformation relations in cylindrical coordinates" not only enriches the reader with new knowledge, but also inspires further research and discoveries in the field of mechanics. It raises important questions about the behavior of materials under different loads and how this knowledge can be applied to create safer and more efficient designs. If you are looking for a deep and meaningful study in the field of nonlinear mechanics, this book will become an indispensable source of information for you. It will be useful not only for those who already work in this field, but also for those who are just starting their way in the world of mechanics and engineering. Do not miss the opportunity to expand your horizons and deepen your knowledge with this fascinating and informative work!