"Mathematical Competitions ." Arithmetic and Algebra" by Dynkin E. B. , Molchanova S. A. and Rosenthal A. L. is a unique manual that will be a real discovery for everyone interested in mathematics, especially in the context of preparing for various competitions and Olympiads. This work is not just a textbook, but a whole world of fascinating problems and theoretical foundations that will help the reader to better understand arithmetic and algebra, as well as develop logical thinking and analytical abilities. The book covers a wide range of topics, ranging from simple arithmetic operations to more complex algebraic concepts. The authors offer readers not only theoretical materials, but also a lot of practical problems that will help to consolidate the knowledge gained. Each chapter of the book is designed to seamlessly introduce the reader to the material, starting with the basics and gradually moving to more complex concepts. This makes the book ideal for both students seeking to improve their skills and for students preparing for Olympiads and competitions. "Mathematical Competitions . Arithmetic and Algebra” will be especially useful for high school students, as well as for students who want to deepen their knowledge in mathematics. The book is suitable for both self-study and for use in the school program. Teachers of mathematics will also find in it a lot of useful materials for preparing their students for competitions. The topics raised in the book cover not only arithmetic and algebra, but also develop critical thinking, teach to solve non-standard problems and apply mathematical knowledge in various situations. The authors emphasize that mathematics is not only a set of formulas and rules, but also a way of thinking that helps to analyze and solve problems. This makes the book relevant not only for mathematics lovers, but also for anyone who wants to develop their analytical abilities. The style of the authors is clear and accessible. They are able to explain complex things in simple language, which makes the material understandable even for those who do not have deep knowledge in mathematics. Dynkin, Molchanov and Rosenthal are well-known specialists in mathematics, and their experience and knowledge are reflected in every page of the book. Their previous work is also noteworthy, and many readers are already familiar with their other publications, such as "Mathematics Tasks for Olympiads" and "Mathematical Methods". If you are looking for a book that will help you not only prepare for mathematical competitions, but also to love mathematics, then “Mathematical competitions . Arithmetic and Algebra” will become your reliable companion It will inspire you to explore new topics, help develop problem-solving skills and teach you to think outside the box. Do not miss the opportunity to immerse yourself in the fascinating world of mathematics, which opens before you this book. Thus, “Mathematical competitions . Arithmetic and Algebra" is not just a manual, but a real find for everyone who wants to deepen their knowledge in mathematics and prepare for competitions. Get inspired, learn and open new horizons with this wonderful book!