The Theory of Symmetry: Lecture Notes and Tasks by L. K. Aminova is a fascinating and deep immersion in the world of symmetry, which will be a real discovery for both students and teachers interested in physics, mathematics and even philosophy. This work not only serves as a textbook, but also represents a unique source of knowledge that will help readers understand the complex concepts and principles underlying symmetry in various scientific disciplines. Symmetry is not just an aesthetic principle, it permeates all aspects of our life and science. In the book, Aminova examines not only the mathematical aspects of symmetry, but also its physical manifestations, which makes the material especially relevant for those who want to deepen their knowledge in these areas. The author offers readers an accessible and understandable language of presentation, which allows even those who are not specialists to easily assimilate complex ideas. The book consists of lecture notes, which were developed on the basis of the author's many years of experience in teaching and scientific work. Each section includes not only theoretical foundations, but also practical tasks that will help to consolidate the knowledge gained. This makes the book an ideal guide for undergraduates, graduate students, and anyone interested in physics and mathematics. The topics raised in Symmetry Theory cover a wide range of topics, such as symmetry in particle physics, crystals, and relativity theory. The author skillfully connects these concepts with real examples, which allows the reader to see how symmetry affects our understanding of the universe. The book also touches on the philosophical aspects of symmetry, making it interesting for a wider audience, including those interested in science in the context of its impact on human perception and thinking. L. K. Aminov is a well-known Russian scientist and teacher who has many publications in the field of theoretical physics. His style of presentation is clear and logical, which makes complex concepts understandable. Readers familiar with his other works will appreciate the consistency and depth of analysis that Aminov applies in his new book. The book will be especially useful for undergraduate and graduate students, as well as for teachers who are looking for quality materials for their classes. It will be an excellent addition to the library of everyone who seeks to expand their knowledge in the field of science and technology. If you are looking for literature that will help you understand the complex issues of symmetry, as well as see how these concepts are applied in real life, “Theory of symmetry: lecture notes and tasks” is exactly what you need. Do not miss the opportunity to immerse yourself in the world of symmetry, which will open up new horizons for you in understanding the laws of nature. Read, learn and be inspired!