The book "Works of the Third All-Union Mathematical Congress", edited by such authoritative figures as C. M. Nikolsky and other outstanding scientists, is a unique collection of scientific works presented at the third all-Union mathematical congress, held in the Soviet Union. This publication not only enriches the reader with new knowledge in the field of mathematics, but also immerses in the atmosphere of scientific search and exchange of ideas that were relevant in the middle of the 20th century. In the pages of the book, the reader will find a variety of studies covering a wide range of mathematical disciplines - from number theory and algebra to analysis and geometry. Each work presented in the collection is the result of in-depth reflections and experiments conducted by leading mathematicians of the time. This is not just a collection of articles; it is a living chronicle of scientific progress, reflecting the spirit of the time and the desire of scientists for new discoveries. The book will be especially interesting for students, graduate students and teachers of mathematical faculties, as well as for all those who are passionate about mathematics and want to understand its theoretical foundations more deeply. It will become a valuable resource for researchers working in the field of applied mathematics, as well as for those who are interested in the history of science and the development of mathematical thought in the USSR. Readers who are looking for inspiration and new ideas for their own research will find many interesting approaches and methods in this collection. The topics raised in the Proceedings of the Third All-Union Mathematical Congress range from fundamental questions concerning the foundations of mathematics to practical applications of mathematical theories in various fields of science and technology. This publication allows you to trace how mathematics interacts with other sciences and how it affects the development of technology. In the context of rapid scientific progress, it is important to understand how ideas presented in the past shape our current perception of science and technology. Style C. M. Nikolsky, as editor, is distinguished by the clarity and accessibility of the presentation . It skillfully combines complex mathematical concepts with simple and understandable examples, making the material available to a wide audience. Nikolsky is also known for his work in functional analysis and operator theory, and his contributions to this book highlight his deep understanding of mathematics as a science. Readers familiar with his other works will appreciate his ability to systematize and structure scientific material. "Works of the Third All-Union Mathematical Congress" is not just a book, but a whole epoch in the history of mathematics. It will be interesting not only for those who are engaged in mathematics professionally, but also for those who want to expand their horizons and learn more about how this science developed in the Soviet Union. If you are looking for a deep and meaningful reading that can inspire new ideas and discoveries, this edition will be a real find for you. In conclusion, the Proceedings of the Third All-Union Mathematical Congress is not just a collection of articles, but an important contribution to the scientific community, which continues to be relevant today. This book will become an integral part of the library of everyone who appreciates mathematics and its endless possibilities.