The book Discrete Mathematics for Computer Scientists and Economists by Gusev is a fascinating and deep dive into the world of discrete mathematics, which is becoming increasingly relevant in the modern world, especially for those associated with information technology and economics. This publication is not just a textbook, but a real find for students, graduate students and anyone who wants to deepen their knowledge in this area. Discrete mathematics is a branch of mathematics that studies structures that have discontinuous values. It covers topics such as graphs, sets, logic, combinatorics and algorithms. Gusev in his book masterfully explains how these concepts are applicable in computer science and economics, which makes the material especially valuable for students of these areas. Readers will be able to see how mathematical models help solve real-world problems, from process optimization to data analysis. The book will be of interest not only to students, but also to teachers, researchers and practitioners working in the field of information technology and economics .. If you are looking for a way to improve your skills in mathematics, as well as to understand how to apply this knowledge in practice, this publication will be a real guide for you. Gusev creates an accessible and understandable text that does not overload the reader with complex terms, but on the contrary, helps to easily absorb material. The topics raised in the book cover a wide range of issues, ranging from the basics of logic and set theory to more complex concepts such as graph theory and combinatorics. Gusev not only lists facts and formulas, but also offers many examples and tasks that help to consolidate knowledge. This makes the book not only a theoretical tool, but also a practical tool for solving real problems. The author's style is clear and accessible. Gusev is able to explain complex things in simple language, which makes his books popular among students. His other well-known works, such as "Algebra and the Beginning of Analysis" and "