The Book of Thought [D.T.] .................................... G. Fundamentals of Functional Analysis”, written by a team of authors, is a fascinating and deep immersion in the world of functional analysis one of the key areas of mathematics, which finds application in a variety of scientific disciplines. This work will be a real discovery for students, graduate students and anyone interested in mathematics, as well as for those who want to expand their knowledge in the field of analysis and its applications. Functional analysis is not just a set of theorems and formulas, it is a whole philosophy that allows you to look at mathematical objects from a new perspective. The Book of Thought [D.T.] .................................... G. Fundamentals of Functional Analysis" offers the reader not only theoretical foundations, but also practical examples that make the material more accessible and understandable. The authors seek to convey to the reader that functional analysis is not just an abstract science, but a powerful tool that can be used to solve real problems in physics, engineering and other fields. This book will be of interest to students of mathematical and physical faculties, as well as teachers who are looking for high-quality and modern educational material. It is suitable for those who already have basic knowledge in mathematics and want to deepen their knowledge in functional analysis, as well as for those who seek to understand how theoretical concepts can be applied in practice. Readers interested in mathematical modeling, optimization, and operator theory will find many useful ideas and approaches in this book. The topics raised in the book cover a wide range of issues ranging from basic concepts of functional analysis, such as vector spaces and linear operators, to more complex concepts, such as spectral theory and functional spaces. The authors emphasize the importance of understanding these foundations to further explore more complex topics, such as integration theories and differential equations. The book also contains many tasks and exercises that will help the reader to consolidate the knowledge gained and develop analytical thinking. The style of the authors is distinguished by clarity and accessibility, which makes the material easy to perceive. They use many examples and illustrations to illustrate complex concepts, which allows the reader not only to grasp the theory, but also to see how it works in practice. In addition, the book includes historical background and context, which helps to better understand the development of functional analysis as a science. If you are looking for similar works, then you may be interested in books by authors such as G. F. Daley, "Functional Analysis" or "