The Book of Mathematics . Numerical and functional series”, created by the team of authors, is a fascinating and deep immersion into the world of numbers and functions. This edition will be an indispensable assistant for students, graduate students and anyone interested in mathematics at a deeper level. If you want to understand how numerical and functional series work, and how they are applied in various fields of science and technology, then this book is for you. The authors focus on the basic concepts and methods associated with numerical and functional series. They not only explain theoretical aspects, but also offer many practical examples, which makes the material accessible and understandable. The reader will be able to learn about the convergence and divergence of series, about the various tests that help determine these properties, as well as about the application of series in mathematical analysis and other disciplines. The book is written in clear and accessible language, which allows readers with different levels of training to easily digest the material. This is especially important for students who are just beginning to learn more complex aspects of mathematics. The authors pay attention not only to formal definitions, but also to intuitive understanding of what makes the learning process more exciting. Who can like this edition? First of all, students of mathematical and technical specialties, as well as those who are preparing for exams or Olympiads in mathematics . But not only them! The book will be of interest to anyone who wants to expand their knowledge in the field of mathematics, regardless of age. Teachers and teachers will also find it useful materials for their lessons and lectures. The topics raised in the book are relevant and important for understanding many modern scientific and engineering disciplines. Numerical and functional series play key roles in mathematical modeling, probability theory, statistics, and even economics. Understanding these concepts opens the door to more complex topics such as function analysis, differential equations, and numerical methods. The style of the authors is clear and logical, which makes it easy to follow the course of thought and not lose the thread of the narrative. The book is replete with illustrations and graphs that help visualize complex ideas and make them more understandable. This is especially important for visual learners who better perceive information in graphic form. In addition, the team of authors includes experienced teachers and researchers who know how to transfer their knowledge and experience to readers. Their previous work covers a wide range of topics related to mathematics, and many of them have already established themselves as authoritative sources in the scientific literature. If you are looking for literature that will help you understand the numerical and functional series, this book will become your reliable companion. It will not only enrich your knowledge, but also inspire you to further study mathematics. Do not miss the opportunity to immerse yourself in this fascinating world, where numbers and functions become not just abstractions, but powerful tools for solving real problems. "Mathematics" . Numerical and functional series” is not just a textbook, but a real find for anyone who wants to deepen their knowledge and skills in mathematics. Do not miss the chance to take a step towards understanding complex mathematical concepts and discover new horizons in the world of numbers!