Multiplicative Systems of Functions and Harmonic Analysis on Zero-Dimensional Groups by G. N. Aghaev, N. I. Vilenkin and other authors, is a unique study that immerses the reader in the world of mathematical analysis, harmonic theory and functional systems. This work will be a real find for students, graduate students and researchers interested in modern areas of mathematics, especially in the field of group analysis and function theory. The book discusses multiplicative function systems that play a key role in various mathematical disciplines. The authors, possessing deep knowledge and experience, offer the reader not only theoretical foundations, but also practical applications, which makes the material accessible and understandable. Unlike many textbooks, "Multiplicative Function Systems and Harmonic Analysis on Zero-Dimensional Groups" focuses on the relationship between different mathematical concepts, allowing the reader to see a holistic picture. The topics raised in the book cover a wide range of issues, ranging from the basics of harmonic analysis to the complex aspects of multiplicative systems. The authors explore how these systems can be used to solve specific problems, making the book particularly valuable for practicing mathematicians and researchers. Readers will be able to find here not only theoretical calculations, but also examples that illustrate the application of the concepts studied in real problems. The book will be of interest not only to specialists in the field of mathematics, but also to those who seek to expand their knowledge in related fields, such as physics, computer science and engineering. It is suitable for both undergraduate and graduate students who are looking for an in-depth understanding of harmonic analysis and its application in various scientific research. Also, thanks to a clear and logical presentation of the material, the book can be useful to teachers who want to enrich their courses with new ideas and approaches. The style of the authors is distinguished by depth and accuracy, which allows the reader to easily assimilate even the most complex concepts. G. N. Aghayev and N. I. Vilenkin is known for his work in function theory and analysis, and their experience is reflected in every page of this book. Their previous publications have also received recognition in the scientific community, which adds additional value to this work. “Multiplicative systems of functions and harmonic analysis on zero-dimensional groups” is not just a textbook, but a real encyclopedia of knowledge that inspires further research and discoveries. Readers interested in mathematics will be pleasantly surprised at how the authors skillfully connect theory with practice, creating a bridge between abstract concepts and real-world applications. If you are looking for a book that will help you deepen your knowledge in the field of harmonic analysis and multiplicative systems, then this work will become your reliable companion. Do not miss the opportunity to discover new horizons in mathematics and expand your scientific horizons with the help of “Multiplicative systems of functions and harmonic analysis on zero-dimensional groups”.