Discrete Mathematics . H. 1. Initial concepts of set theory and relations, mathematical logic: a textbook by M. G. Nekrasova is an important and necessary resource for students, graduate students and anyone interested in the basics of discrete mathematics. This textbook, developed as part of the educational program of Komsomolsk-on-Amur State Technical University, offers readers a deep immersion in the world of mathematical concepts that underlie many modern technologies and scientific research. The book covers key topics such as set theory, relationships, and mathematical logic. These concepts are fundamental to understanding the more complex mathematical structures and algorithms that are used in computer science, programming, and other technical disciplines. In the first part of the manual, the author focuses on the initial concepts, which makes it ideal for those who are just starting out in the study of discrete mathematics. Readers will be able to learn how to formulate and analyze sets, how to establish relationships between elements, and how to apply logical operations to solve various problems. This book will be especially useful for students of technical specialties, as well as for those who are preparing for exams in mathematics or computer science. It is suitable for both self-study and as a training material for classes in universities . Young professionals working in the field of programming, data analysis and algorithm development will also find in it a lot of useful information that will help them better understand the theoretical foundations of their profession. The topics raised in the book go beyond the simple study of formulas and theorems. The author focuses on the practical application of mathematical concepts, which makes the material more accessible and understandable. Readers will be able to see how set theory and logic find application in real-world problems such as process optimization, software development, and data analysis. This makes the book not only a tutorial, but also a practical guide for future professionals. Writing style M. G. Nekrasov is distinguished by clarity and logic, which allows readers to easily digest the material .. The author uses many examples and tasks, which helps to consolidate the knowledge gained in practice. This makes the tutorial not only informative, but also fascinating. Nekrasov is also known for his other work in mathematics and computer science, which confirms his status as an expert in the field. If you are looking for a quality discrete mathematics tutorial that will help you master the basic concepts of set theory and logic, then "Discrete Mathematics. H. 1" would be a great choice. This book will not only expand your knowledge, but also inspire you to further study mathematics and its applications in various fields. Do not miss the opportunity to immerse yourself in the world of numbers and logic, which opens up new horizons and opportunities for you!