Bertrand Russell's book Mathematical Logic Based on Type Theory is not just a scientific work, but a real milestone in the history of philosophy and mathematics, which opens doors to the world of logical thinking and formal systems. Russell, one of the greatest philosophers and logicians of the 20th century, offers readers a unique look at the structure and foundations of mathematics, using his famous type theory. This work will be a real discovery for everyone who is interested not only in mathematics, but also in philosophy, logic and theoretical computer science. At the heart of the book is the idea that traditional approaches to mathematical logic can lead to paradoxes and inconsistencies. Russell introduces the concept of types that avoids these problems by structuring logical statements and mathematical statements into a hierarchy. This makes his work not only theoretically significant, but also practically useful for those who are engaged in formal systems and programming. Readers who are familiar with such works as "Principles of Mathematics" or "Logic and Philosophy" will find in this book the continuation and deepening of their knowledge. The book will be of interest to a wide range of readers: from undergraduate and graduate students studying mathematics and philosophy, to professionals in the field of computer science and logic. If you are passionate about questions related to the basics of mathematics, logical paradoxes or the philosophy of language, then “Mathematical logic based on type theory” will become a real storehouse of knowledge for you. Russell not only explains complex concepts, but he does so with such passion and clarity that even the most convoluted ideas become comprehensible. The topics raised in the book cover a wide range of issues, from the nature of mathematical truths to the relationship between language and reality. Russell explores how language shapes our understanding of mathematics and how logical structures can be used to build robust theories. This work also addresses broader philosophical questions about what truth is and how we can define it in the context of formal systems. Russell's style in this book is distinguished by clarity and logical rigor. He masterfully combines philosophical reflections with mathematical accuracy, which makes the text not only informative, but also fascinating. His ability to explain complex ideas in simple language makes it easy for readers with no in-depth knowledge of logic to follow his thoughts. This quality makes his works available to a wide audience, which is certainly one of the reasons for his popularity. If you are looking for books that can complement your understanding of logic and philosophy, pay attention to the works of authors such as Gottlob Frege, Kurt Gdel and Alfred Tarski. They have also explored issues related to the basics of mathematics and logic, and may be of interest to those who are immersed in Russell's world. In conclusion, "Mathematical logic based on type theory" is not just a textbook, but a deep philosophical study that makes you think about the nature of knowledge and logic. This book will be an indispensable resource for anyone who seeks to understand how mathematics and logic interact in our perception of the world. Russell offers readers not only theoretical concepts, but also practical tools for analyzing and understanding complex logical structures, which makes his work relevant to this day.