Olympiad ark

The book contains examples of tasks of various difficulty levels - from initial to rather complex ones - on most of the most important topics found at mathematical olympiads. In many subjects, brief theoretical information is given, sometimes affecting interesting mathematical plots. The book contains rich material supplementing the school curriculum can be used in mathematical circles, elective courses, and extracurricular work. In preparation for mathematical Olympiads, it will be useful to both beginner and "Olympiad professionals" for repetition.
The book is designed for schoolchildren of grades 9-11, teachers, and leaders of circles. It will be interesting for schoolchildren of younger grades and all fans of mathematics.
2nd edition, stereotypical