The book "Subprojective Spaces" by B. F. Kagan is a fascinating and in-depth study in the field of mathematics, which opens the world of abstract concepts and theoretical structures to the reader. If you have ever thought about how geometric structures are formed and how they can be presented in different contexts, then this work will be a real discovery for you. In Subprojective Spaces, Kagan offers the reader a unique perspective on the concept of subprojectivity, exploring its relationship to other mathematical concepts and theorems. The author not only explains what subprojective spaces are, but also immerses them in their application in various areas of mathematics, such as topology, algebra and geometry. The book is filled with examples that help to better understand complex ideas, and also contains many tasks for self-solution, which makes it an ideal guide for both students and teachers. This book will be of interest primarily to those who are passionate about mathematics and want to deepen their knowledge in the field of geometry and topology. Students, graduate students and teachers of mathematical specialties will find in it valuable ideas and fresh views on familiar concepts. However, even if you are not a professional mathematician, but just like to solve puzzles and explore new horizons, “Subprojective spaces” can be a real challenge for you and a source of inspiration. The topics raised in the book concern not only pure mathematics, but also philosophical issues related to the perception of space and its properties. Kagan makes us think about how we perceive geometric objects and how they can be represented in different coordinate systems. This makes the book not only a textbook, but also a real philosophical reflection on the nature of mathematics. The style of Kagan is clear and logical, which allows even complex ideas to be presented in accessible language. He masterfully combines theoretical calculations with practical examples, which makes reading fascinating and informative. In. F. Kagan is the author of several other well-known papers in mathematics, and his in-depth knowledge and passion for the subject are prominent on every page. His previous books have also received recognition among mathematicians and students, which confirms his status as an expert in his field. If you are looking for literature that will not only expand your knowledge, but also make you take a fresh look at familiar things, “Subprojective spaces” is exactly what you need. This book will be a great addition to your library, and can also be an interesting gift for friends and colleagues who are passionate about mathematics. Do not miss the opportunity to immerse yourself in the world of subprojective spaces and discover new horizons in the study of mathematics. Book B. F. Kagan is not just a textbook, but a real intellectual adventure story that awaits its reader.