"Linear Operators and Approximation Theory" by P. P. Korovkina is a fascinating and deep dive into the world of mathematical analysis, which will be a real find for students, graduate students and anyone interested in modern methods of solving problems related to linear operators and approximation of functions. This work is not just a textbook, but a whole encyclopedia of knowledge, in which the author shares his experience and understanding of complex mathematical concepts. The book focuses on linear operators, key elements of functional analysis that are widely used in various fields of science and technology. Korovkin masterfully explains how linear operators can be used to solve problems related to the approximation of functions, and how these methods can be applied in real-world situations. The reader will be able to learn about the different types of operators, their properties and applications, as well as how they can effectively solve problems arising in mathematics and related disciplines. The book will be of interest not only to students of mathematical and physical faculties, but also to practitioners working in the field of applied mathematics, computer science and engineering .. It will be a useful resource for those who seek to deepen their knowledge in functional analysis, as well as for teachers who want to enrich their courses with relevant examples and methods. The topics raised in the book cover a wide range of issues, from the basics of linear algebra to complex theorems about the convergence and stability of operators. Korovkin not only expounds the theory, but also offers many practical problems, which allows the reader to consolidate the knowledge gained and apply it in practice. This book will become a real guide to the world of linear operators and approximation theory, opening up new horizons and opportunities for the reader. The author's style is distinguished by clarity and accessibility, which makes complex mathematical concepts understandable even for those who are just starting their way in this area. P. P. Korovkin is a well-known mathematician and teacher, the author of many scientific works and textbooks that have earned recognition both in Russia and abroad. His ability to explain complex things in simple language and give practical examples makes his books especially valuable for students and teachers. If you are looking for literature that will help you understand linear operators and approximation theory, then “Linear operators and approximation theory” is exactly what you need. This book will not only be a useful tutorial, but also a source of inspiration for those who want to deepen their knowledge in mathematics. Do not miss the opportunity to discover a world where mathematics becomes not only a science, but also an art, and linear operators are the key to solving many problems. Thus, "Linear Operators and Approximation Theory" P. P. Korovkina is not just a book, but a real find for anyone who wants to expand their horizons in mathematics and applied sciences. Do not miss the chance to become a part of this fascinating journey into the world of linear operators!