Proceedings of the Seminar on Functional Analysis . Issue 5", edited by well-known scientists, including M. A. Krasnoselsky, represents an important contribution to the field of mathematical science, and in particular, functional analysis. This issue is part of a series devoted to current problems and achievements in this field, and will certainly attract the attention of both professionals and students interested in mathematics. Functional analysis is a branch of mathematics that studies the spaces of functions and their properties, and this issue contains materials that highlight the latest research and development in this field. Readers will be able to get acquainted with new methods and approaches that can be applied in various fields of science and technology .. The book presents articles written by leading experts who share their discoveries and theoretical developments, which makes it a valuable resource for those who want to be aware of current trends in functional analysis. This book will be of interest not only to mathematicians, but also to physicists, engineers and specialists in the field of computer science, who use methods of functional analysis in their work. Graduate and postgraduate students studying mathematics or related disciplines will find useful materials in it to prepare for exams and scientific papers . It may also be of interest to teachers who are looking for new approaches to learning and want to expand their knowledge in the field of functional analysis. The topics raised in the "Works of the Seminar on Functional Analysis" cover a wide range of issues, from operator theory to the application of functional analysis in mathematical physics. Each article in this issue is an independent study, but at the same time they are interrelated and create a holistic view of the current state of science. The book emphasizes the importance of an interdisciplinary approach and shows how functional analysis can be applied in a variety of scientific contexts. The style in which the articles are written is characterized by high scientific rigor and clarity of presentation .. The authors strive to convey complex ideas in an accessible language, which makes the material understandable even for those who are just beginning to get acquainted with functional analysis. M. A. Krasnoselsky, as one of the editors, is known for his contributions to operator theory and functional spaces, and his experience and authority in this area give the book added value. If you are looking for literature that will help you to better understand functional analysis and its application, "Works of the workshop on functional analysis. Episode 5" will be a great choice. This book will not only expand your knowledge, but also inspire new research and discoveries. It can become an indispensable assistant in your scientific activity and a source of ideas for future projects. Do not miss the opportunity to immerse yourself in the world of functional analysis with this fascinating and informative book. Discover new horizons of mathematics and find inspiration for your own research!