The book "Theory of automata, languages and calculations", written by a team of authors, is a fascinating and deep immersion in the world of theoretical computer science. This edition is not just a textbook, but a real encyclopedia of knowledge, which opens the door to the reader in a complex but exciting world of automata, formal languages and computational processes. From the first pages, the reader finds himself at the center of a discussion of fundamental concepts such as finite automata, context-free grammars, and computability. The authors masterfully explain how these theoretical constructs are applied in real life, from compiling programming languages to developing algorithms and data processing systems. The book not only provides a theoretical basis, but also demonstrates the practical application of this knowledge, which makes it especially valuable for students and specialists in the field of computer science, programming and mathematics. This book will be of interest to both undergraduate and graduate students studying theoretical computer science, as well as practicing programmers and developers seeking to deepen their knowledge. If you are passionate about such topics as algorithms, data structures, programming languages, or want to understand how modern computing systems work, the Theory of Automatics, Languages and Computing will become an indispensable assistant for you. The topics raised in the book cover a wide range of issues, ranging from the basics of formal languages to complex concepts such as the incompleteness theorem and computational complexity. The authors are not afraid to delve into complex aspects, which allows the reader to get a complete idea of the subject. They also emphasize the importance of theoretical knowledge for practical activities, which makes this book especially relevant in the rapidly developing world of technology. The style of the authors is clear and accessible, which allows even beginners in this area to easily absorb the material. Each section is accompanied by examples and tasks that help to consolidate the knowledge gained and develop critical thinking skills. The book also includes many illustrations and diagrams that make complex concepts more understandable and illustrative. If you are familiar with other works in the field of theoretical computer science, such as "