The book "Geometric characteristics of flat sections of variable rigidity" by A. and . Dudyak is a unique publication that will become a real find for students, graduate students and specialists in the field of mechanics, construction engineering and materials science. In this work, the author examines in detail one of the most relevant topics in modern design - the geometric characteristics of flat sections that have variable stiffness .. From the first pages of the book, the reader is immersed in a world of complex but fascinating science, where each formula and each definition has its own meaning and place. Dudyak not only expounds the theory, but also illustrates it with practical examples, which makes the material accessible and understandable even for those who are just starting their way in this field. The author masterfully combines theoretical aspects with practical tasks, which allows the reader not only to understand, but also to apply the knowledge gained in real conditions. The book will be especially interesting for those who are fond of engineering, architecture and construction. Students of technical universities, graduate students and young professionals will find in it a lot of useful information that will help them in their studies and professional activities. Also, this edition will be an excellent help for teachers who are looking for high-quality materials for the preparation of lectures and seminars. The topics raised in the book cover a wide range of issues related to the calculation and analysis of cross sections, their rigidity and stability. Dudyak emphasizes the importance of taking into account variable rigidity in the design of structures, which avoids many problems associated with the strength and durability of materials. The author shares his observations and conclusions based on many years of experience, which gives the book special value. Writing style A. and . Dudyak is clear and logical . He is able to explain complex things in simple language, which makes his work available to a wide audience. In his works there is always a desire for scientific accuracy, but at the same time he does not forget that science should be interesting and fascinating. Among other well-known works of the author are “Fundamentals of material mechanics” and “Theory of elasticity”, which are also popular among students and specialists. The book "Geometric characteristics of flat sections of variable rigidity" deserves attention not only due to its content, but also the relevance of the topics it touches. In the conditions of modern construction, where the requirements for the strength and reliability of structures are becoming more stringent, knowledge of the geometric characteristics of the sections becomes necessary for successful work in this area. If you are looking for a high-quality and informative publication that will help you understand the intricacies of design and analysis of structures, then this book will be a real find for you. It will not only expand your knowledge, but also inspire new ideas and solutions in your professional activities. Do not miss the opportunity to get acquainted with the work of A. and . Dudyak and immerse yourself in the world of geometric characteristics that play a key role in modern construction and engineering.