Moscow University Bulletin . Series 1. Mathematics and Mechanics . No. 6" is a collection of articles that is a unique publication that combines the work of leading scientists and researchers in the field of mathematics and mechanics. Under the editorship of the team of authors, this issue of the Bulletin not only continues the traditions of the scientific publication, but also opens up new horizons for the study of current problems and theories that concern the modern scientific community. The book is addressed primarily to students, graduate students and teachers of higher educational institutions, as well as anyone interested in mathematical sciences and mechanics. If you are interested in mathematical models, number theory or mechanics of solids, then this edition will be a real find for you. Here you will find not only theoretical studies, but also practical applications that will help to understand more deeply complex concepts and their use in real life. Each article in this issue of the Bulletin is the result of the painstaking work of authors who seek to convey their ideas and discoveries to the reader. The topics covered in the issue cover a wide range of issues: from new methods for solving differential equations to the analysis of dynamical systems. Reading this collection, you will be able to get acquainted with the latest achievements in the field of mathematical modeling, as well as with original approaches to solving classical problems. One of the key topics raised in this issue is the interaction of mathematics and mechanics, which is especially relevant in the light of modern scientific research. The authors explore how mathematical theories can be applied to solve mechanical problems, and vice versa, how practical problems in mechanics can inspire new mathematical discoveries. This interaction not only enriches both disciplines, but also opens up new opportunities for interdisciplinary research. The style of presentation of articles in the journal is characterized by scientific rigor and clarity, which makes the material available to a wide audience. The authors seek to explain complex concepts in simple language, which allows even those who are not experts in this field to get an idea of the issues under consideration. This approach makes the Bulletin of Moscow University a valuable resource not only for professionals, but also for science lovers. If you are looking for literature that will help you deepen your knowledge in mathematics and mechanics, this newsletter will be a great addition to your library. It will not only enrich your scientific outlook, but also inspire new research and discoveries. In addition, the "Bulletin of Moscow University" is part of a large tradition of scientific thought, which was founded in the XIX century and continues to develop today. Do not miss the opportunity to get acquainted with this unique publication, which is not only a source of knowledge, but also a platform for the exchange of ideas between scientists. Moscow University Bulletin . Series 1. Mathematics and Mechanics . No. 6" is not just a book, but a whole world filled with mathematical puzzles and mechanical discoveries, which is waiting for you to explore it.