The book "Additional chapters of the theory of ordinary differential equations" by Vladimir Igorevich Arnold is an outstanding work that immerses the reader in the world of mathematical theory, revealing complex and fascinating aspects of ordinary differential equations before him. Arnold, known for his deep and original views on mathematics, offers readers not just a textbook, but a real philosophy of mathematical thinking, where each equation becomes the key to understanding broader patterns. This book is intended for undergraduates, graduate students, and anyone interested in mathematics at a deeper level. It will be especially useful for those who study mathematics, physics or engineering disciplines, as well as for those who seek to expand their knowledge in the field of differential equations. Readers interested in mathematical theory will find in it many interesting ideas and concepts that can inspire new research and discoveries. Arnold raises many topics in his book, ranging from the foundations of the theory of ordinary differential equations to more complex concepts, such as the stability of solutions, qualitative analysis and geometric aspects. He masterfully combines theory with practical examples, which makes the material accessible for understanding and application. The reader will be able to see how abstract mathematical ideas find their application in real problems, which makes the study of theory fascinating and useful. Arnold's style is distinguished by clarity and elegance. He is able to explain complex things in simple language, which makes his books especially attractive to a wide audience. In "Additional Chapters" he uses many illustrations and examples that help the reader to better assimilate the material and see its application in various fields of science and technology. This approach makes the book not only a textbook, but also a real guide to the world of mathematical ideas. The book also touches on important aspects, such as the link between mathematics and other sciences, making it particularly relevant in today's world, where interdisciplinary research is becoming increasingly popular. Arnold shows how differential equations can be used to model physical processes, biological systems, and even social phenomena, thus emphasizing the universality of mathematical tools. If you are looking for literature that will help you deepen your knowledge of differential equations and expand the horizons of mathematical thinking, Arnold's "Additional Chapters of the Theory of Ordinary Differential Equations" is exactly what you need. This book will be a reliable companion in your educational path, as well as a source of inspiration for further research. Arnold is the author of many other well-known works, such as Geometry and Dynamics and Ordinary Differential Equations, which also deserve attention. His works are distinguished by their depth of analysis and originality of approach, which makes them valuable for anyone who seeks to understand mathematics as an art. Thus, “Additional Chapters of the Theory of Ordinary Differential Equations” is not just a textbook, but a real find for everyone who wants to immerse themselves in the world of mathematics and discover new horizons of knowledge. Do not miss the opportunity to get acquainted with this fascinating book and allow yourself to be inspired by the great mind of Vladimir Igorevich Arnold.